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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 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 the formula of mean , median , mode ?

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

Xi 0 1 2 3 4 5

Xf 3 3 p 7 p-1 4

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 ?

in a continuous frequency distribution class mark of a class is 85 and its lower limit 83 then what will be the upper limit

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

Find the median of first three observations.

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.

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

a)95

b)25

c)70

d)60

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?

153, 140, 148, 150, 154, 142, 146, 147.

Pls do not give any links.

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

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

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

In a morning walk, I had 20 rounds of a park. During this period I came across person A, person B, person C and person D, 11 times, 7 times, 10 times and 5 times respectively. I want to represent this data graphically, which of the following is the best representation ?

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.

the mean of 20 observation is 25 . if each observation is multiplied by 2 , then find the mean of new observations .

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

wat is histogram , expalin with an example !?expain who to find scale with example !???Find the true class limits of the first three classes of the distribution

1-9 , 10-19, 20-29, 30-39, .... plz tell soon

Differentiate between class limits and true class limits.Give examples

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.

Class size = Difference between class marks of two consecutive classes.= 52 - 47 = 5

Lower-class limit = class marks - 1/2 of class size= 47+2.5 = 49.5

Upper class limit = class marks + 1/2 of class size = 52+2.5 = 54.5

Since, the class-limits form a continuous frequency distribution; the true class limits and the class-limits are the

same

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

how to make class intervals continuous?

use of statistics in our daily life

Find the median of the given data:

27, 9, 2, 35, 13, 7, 40, 20, 28, 22, 25, 24

how to calculate minimum class size?

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.

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

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

62 , 65 , 68 , 70 , 72 , 74 , 76 , 78 , 80 , 82 , 96 , 101,

find

a) the median,

b) the first quartile,

c) the third quartile,

d) the interquartile range (IQR).

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?

find the mean median of first 12 odd composite numbers

How many cubes in all have three sides painted?

(a)?24

(b)?16

(c)?10

(d)?8

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

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.

Q. Find the mean and medium of the following numbers:

155, 160, 145, 149, 150, 147, 152, 144, 148.

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

If lower limit and upper limit of a class are in the

ratio 3 : 5 and its class size is 6, then the classmark

of this class is :

(a) 3 (b) 5 (c) 6 (d) 12

In a frequency distribution,mid value of a class is 10 and width of class is 6. The lower limit of the class isCalculate the mode of each using the empirical formula. 17, 10, 12, 11, 10, 15, 14, 11, 12, 13

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

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

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 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

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

marks:number of students

100-150:60, 150-200:100, 200-300:100, 300-500:80, 500-800:180

draw a histogram

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

how to find minimum class size?

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

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.

The means of two groups of 15 and 20 observations are 20 and 25 respectively. Find the mean of all the 35 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.

^{th}observations.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 mean weight of 8 numbers is 15, if each number is multiplied by 2, what will be the new mean

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

If the mean of

observation 2nx_{1},2x_{2},.........2xis 2x bar, show that_{n}2x bar) = 0.

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.

find the mean of the following data by shortcut method

what is the mean of first five natural numbers

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.

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

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.

Class Interval Frequency

0-50 12

51-100 18

101-150 27

151-200 20

201-250 17

251-300 06