HARD
10th ICSE
IMPORTANT
Earn 100

Using the assumed mean method, find the mean of the following frequency distribution.

Class 63-65 66-68 69-71 72-74 75-77
Frequency 4 3 7 8 3

50% studentsanswered this correctly

Important Questions on Statistics

HARD
10th ICSE
IMPORTANT

Find the mean of the following distribution by step-deviation method.

class interval 20-30 30-40 40-50 50-60 60-70 70-80
frequency 10 6 8 12 5 9

 

HARD
10th ICSE
IMPORTANT

Find the mean of the following data by using step-deviation method.

class 0-20 20-40 40-60 60-80 80-100
frequency 17 28 32 24 19

 

HARD
10th ICSE
IMPORTANT

The monthly pocket money of students of a class is given in the following frequency distribution

Pocket money (in ) 100-125 125-150 150-175 175-200 200-225
Number of students 14 8 12 5 11

Find the mean of pocket money using step deviation method.

HARD
10th ICSE
IMPORTANT

Calculate the mean of the scores of 20 students in a Mathematics test.

Marks 10-20 20-30 30-40 40-50 50-60
Number of students 2 4 7 6 1

 

HARD
10th ICSE
IMPORTANT

If the mean of the distribution is 33.2 and the sum of all frequencies is 100, then find the missing frequencies f1 and f2 .

class  6-14 14-22 22-30 30-38 38-46 46-54 54-62 62-70
frequency 11 21 f1 15 14 8 f2 6
EASY
10th ICSE
IMPORTANT
The median of the observations111214, (x-2)(x+4)(x+9)3238 and 47 arranged in ascending order is 24. Find the value of x and hence flnd the mean.
EASY
10th ICSE
IMPORTANT

Prepare the frequency distribution table for the given data.

Marks below 10 below 20 below 30 below 40 below 50 below 60
Number of students 0 15 20 30 35 40

 

EASY
10th ICSE
IMPORTANT

Given, below is a cumulative frequency distribution of 'more than type'.

Marks   Number of students
More than or equal to 60 11
More than or equal to 50 23
More than or equal to 40 43
More than or equal to 30 58
More than or equal to 20 72
More than or equal to 10 82

Change the above data into a continuous grouped frequency distribution.