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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

a)95

b)25

c)70

d)60

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

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

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 ?

141 123 92 85 214 91 94 128 114 120 90 117 121 151

146 133 100 88 100 125 120 108 116 109 117 94 86 196

92 110 119 138 125 117 125 129 103 197 149 139 140 78

205 133 135 121 102 96 80 136

Form the grouped frequency table by dividing the variable range into intervals of equal width of 20 gsm such that the mid value of the first interval is 80 gms.

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

Find the median of first three observations.

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 salary paid to 1000 workers of a factory was found to be Rs. 180.40 later it was discovered to the wages of two workers wrongly taken as Rs. 297 and Rs. 165 instead of Rs. 197 and Rs. 185 find the correct mean

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?

find the mean median or mode:

2,3,4,5,0,1,3,3,4,3,

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

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

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

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

Pls do not give any links.

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

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

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.

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.

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

wat is histogram , expalin with an example !?expain who to find scale with example !???IS THERE ANY FORMULA TO CALCULATE LOWER CLASS LIMITS OF LOWER CLASS,UPPER CLASS LIMIT OF UPPER CLASS , LOWEST CLASS LIMIT UPEER CLASS LIMIT CLASS INTERVALS CLASS SIZE MID VALUEIF ANY OF THE TWO THINGS ARE GIVEN FROM THE ASKED ABOVE.

Differentiate between class limits and true class limits.Give examples

_{i}x_{1}by sigma f_{i}?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.

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.

how to make class intervals continuous?

Xi 0 1 2 3 4 5

Xf 3 3 p 7 p-1 4

use of statistics in our daily life

marks obtained (out of 60 ) | No. of students

5 | 7

15 | 10

20 | 6

35 | 8

40 | 12

45 | 3

50 | 5

60 | 4

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

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.

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

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?

There are 120 students in a class in which 20 of them are girls and rest are boys. The average marks in mathematics of the boys is 65% and that of is 80%, find the average marks of the class

find the mean median of first 12 odd composite numbers

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

how to calculate minimum class size?

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

Find the sum of the deviation of the variable values 3, 4, 6, 8, 14 from their mean.

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:

what is the difference between primary and secondary data?

Find the mean of factors of 24

(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

In a frequency distribution,mid value of a class is 10 and width of class is 6. The lower limit of the class isthe mean of 16 numbers is 8. If 2 is added to every number, what will be the new mean ?

17,2,7,27,15,5,14,8,10,24,

48,10,8,7,18,28

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

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

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

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

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.

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).

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

Please do answer today only...coz it's my exam tomm..plzz..

Thanks is u do ... :)

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

find the mean of the following data by shortcut method

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.

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.

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

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

In a sample of 365 items, 125 are found to be defective. Find the probability of an item selected at random being i) defective ii) not defective

what is the mean of first five natural numbers

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

Class interval: 25-35 35-45 45-55 55-65 65-75 75-85

Frequency: 5 10 15 20 12 8

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.

How many cubes in all have three sides painted?

(a)?24

(b)?16

(c)?10

(d)?8