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Syllabus

Find the missing frequencies in the following frequency distribution whose mean is 50

X

10

30

50

70

90

Total

F

17

fi

32

F2

19

120

what is the formula of mean , median , mode ?

what is the correct formula for adjusted frequency because wile doing the examples on meritnation the formula used was:-

Adjusted frequency= frequency/class size*minimum class size

whereas in the video regarding the histogram where adjusted frequency was used the formula applied there was:-

Adjusted frequency= minimum class size/class size*frequency

what is class, class size, class interval and class marks????? plz plz plz answer fast......or else i will fail.......plz

In a frequency distribution, the mid-value of a class is 20 and the width of the class is 8.then what is the lower limit ?

If mean of 5 observations x , x+2 , x+4 , x+6 , x+8 is 11.

Find the median of first three observations.

18,20,25,26,30,x,37,38,39,48

if the median of the data is 35, find x. in the above data if 48 is changed to 28 what will the new median be

Plz help,

Find the missing frequencies f1 and f2 in the following frequeny distribution, if it is know that the mean of the distribution is 1.46

xi 0 1 2 345 total

fi 46 fi f2 25 10 5200

The mean of first 8 observations is 18 and last 8 observations is 20 . If the mean of all 15 observations is 19 , find the 8 th observation?

The mean height of 10 students is 153 cm. It is discovered later on that while calculating, 151 was misread as 141 cm. Find the correct mean

the two consecutive class marks of a distribution are 52 and 57. find the class limits of two intervals

The mean weight of 8 numbers is 15, if each number is multiplied by 2, what will be the new mean

whats the difference between class interval, class size,class limit,class mark and also ranges,width and length of rectangle ?

21. In the following groups of data, tell whether the mean or the median best describes the data:

(i) 6, 4, 2, 12, 2 (ii) 31, 28, 24, 9, 23 (iii) 45, 51, 47, 65, 36 (iv) 10, 20, 30, 100, 9

Find the value of p, if the mean of the following distribution is 20

x: 15 17 19 20+p 23

f: 2 3 4 5p 6

note : the method should be of sigma fixi.

For a particular year following is the distribution of ages (in years) of primary school teachers in a district

Age (in years)

15-20

20-25

25-30

30-35

35-40

40-45

45-50

No. of teachers

10

30

50

50

30

6

4

1) 1) Write the lower limit of first class interval

2) 2) Determine the class limits of the fourth class interval

3) 3) Find the class mark of the class 45-50

4) Determine the class-size

how too find class marks ??explain with an example ??

wat is histogram , expalin with an example !?expain who to find scale with example !???for calculating mean we should need xf and for calculating median we need cf is that right.

Differentiate between class limits and true class limits.Give examples

1) class mark of a particular class is 6.5 and class size is 3 , then class interval is -

a) 5 - 8 b) 6.5 - 9.5 c) 3.5 - 6.5 d) none of these

2) the mean of 100 observations is 50 . if the observation 50 is replaced by 150 , what will be the resulting mean?

what is the exact formula for ADJUSTED FREQUENCY??????????????

BECAUSE 2 VIDEOS OF THE SAME CHAPTER BUT OF OTHER LESSON SHOW DIFFERENT FORMULA SO WHICH ONE IS CORRECT.

Why is Mode, Mean, Median called as Measures of Central Tendency ?

how to make class intervals continuous?

how to calculate minimum class size?

use of statistics in our daily life

Write the equation y root 3= 8x+root 3 in the form ax+by+c=0. Check weather (0,-1) and (root 3, 9) are the solution of this equation.

Weekly pocket no of student

10_20. 10

20_30 15 30_50 40 50_60 25 60_90 30 90_100 05

Help,

The mean of 25 observatios is 36. Out of thes,if the mean of first 13 observation is 32 and that of last 13 observation is 40,find the 13th observation.

what is weighted arithmetic mean

the mean of 15 numbers is 27 .if each number is multiplied by 4,what will be the mean of the new number

The mean of 40 items is 35 and if each item is multiplied by ‘a’ then the new mean will be

(A) 35 a (B) 35 + a C) 40 D) 40 + a

Mean of 50 observations was found to be 80.4. But later on it was discovered that 96 was misread as 69 at one place. Find the correct mean. If to each observation a constant value k is added, how is the mean affected?

Mean weight of 29 student is 50 kg. if weight of teacher is included the mean weight is 51 kg . Find the weight of the teacher

find the mean median of first 12 odd composite numbers

There are three groups A,B,C with 22,18 and 10 students respectively. The mean weight of the combined set of 50 students is found to be 47.6kg. If the mean weights of groups A and B are 40kg and 50kg respectively, calculate the mean weight of group C.

if the ratio of mean and median of a certain data is 2:3 , then find the ratio of its mode and mean.

The following observation have been arranged in ascending order. if the median of the data is 63, find the value of x

29,32,48,50,x,x+2,72,84,95

Q1. In a family of seven persons there are three earning members having monthly income of Rs. 1800, Rs. 1400 and Rs. 1000. What is the average income of a member in a family?

Q2. The mean weight of 34 students of class 9th of a school is 42kg. If the weight of the teacher be included, the mean rises by 400gm. Find the weight of teacher.

Q3. the mean of six no. is 20. If one no. is excluded, the mean is 15. Find the value of the excluded no.

design a crossword puzzle using mathematical terms

the class marks of distribution are

47,52,57,62,67,72,77,82 determine the class size,class limit,ture class limits.

the mean of five numbers is 30. if one number is excluded, their mean becomes 28. the excluded number is:

Find the mean of factors of 24

In a frequency distribution,mid value of a class is 10 and width of class is 6. The lower limit of the class ishow to construct a continuous grouped frequency distribution table

the mean of 16 numbers is 8. If 2 is added to every number, what will be the new mean ?

(i) He scores more than 80% marks.

(ii) He scores less than 60%marks.

(iii) He scores more than or equal to 40 but less than 80

Class Interval Less than 40 40 - 60 60 - 80 80 -100

Frequency 610 840 750

If x is the number of hours a labourer is on work "and y is his wages in rupees then y=4x+3. Draw the work wages graph of this equation . From the graph , Find the wages of a labourer Who puts in 4 hours of work.

the class mark of a distribution are :

37,42,47,52,57

determine the class size and class limits......

the mean of 5 number is 18 if one number is excluded, their mean is 16 .find the excluded number

how to convert the dis-continuous class into continuous class interval

the median of a data arranged in ascending order 9,14,15,20,x+1,x+3 ,31,36,44,51,is 25 . find the value of x

Find the value of x and y in following distribution if it known that the mean of the distribution is 1.46

No. of students 0 1 2 3 4 5 Total

Frequency 46 x y 25 10 5 200

the mean of 5 numbers is 7 if one more number is included the mean increases by 2. find the number included

find the mean of all factors of 10

if the mean of the observations x, x+3 ,x+5 ,x+7, and x+10 is 9. what is the mean of last three observations.

10 observations 6, 14, 15, 7, x+1, 2x-13, 30, 32, 34, 43 are written in ascending order. The median of the data is 24. Find the value of x.

The mean of 12 numbers is 40. if each number is divided by 8 what will be the mean of the new number

what is adjusted frequency ? why is it used ? please explain in detail.

mean of 50 obs. was found to be 80.4 but later on it was found that 96 was misread as 69 at one place . find the correct mean

the numbers 2,3,4,4,2x+1,5,5,6,7, are written in ascending order.if the median is 5,find x.hence find mode

how to find the class size and class interval when the class marks are given.pls tell fast....

What is an ogive?How to construct it? PLz give one or 2 examples.

The mean of 20 numbers is 18. If 3 is added to each of the first ten numbers, find the mean of the new set of 20 numbers.

Give one example of a SITUATION where:

i. mean is an appropriate measure of central tendency.

ii. median is an appropriate measure of central tendency but mean is not.

i cant understand the question of the above let's review..

the question is find the total no of students.

The mean monthly salary of 10 members of a group is Rs. 1445, one more

member whose monthly salary is Rs. 1500 has joined the group. Find the mean

monthly salary of 11 members of the group.

find the mean of the following data by shortcut method

what is class limit and how are they determined

what is the mean of first five natural numbers

while findind class length of a rectangle in histogram,from which no. we have to multiply it??

The mean 20 observation is 25. In each observation is multiplied by 2. What is the new mean of Observation?????/

5,7,10,12,2x- 8,2x+10,35,41,42,50 are arranged in ascending order . if their median is 25 the find x.

The mean of 200 items was 50. Later on it was discovered that 2 items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.

In the chapter statistics of class 9, in the topic

Constructing Histogram for Data Having Different Class IntervalsThere is a video which tells us that the formula for calculating adjusted frequency is "minimum class size/ class size X frequency."In the next topic which isExamples on Constructing Histogram for Non-Uniform Class SizesThere is a video which tells us that the formula for calculating adjusted frequency is" frequency of class interval/ class size of that class X minimum class size"So, which one is the correct method or the conventional method?