Question

Q1: The CAT Scores of 60 students are summarized below:
Class
40-50 50-60 60-70 70-80 80-90 90-100
Frequency 10
8
12
15
10
5
Calculate the sample mean, the sample variance and the standard deviation for the grouped data.​

Answer 1

Answer:

Sample mean = (X1+ X2+ ...... +Xn) /(N)

where X1, X2, ... Xn are the scores of 60 students

N is the total no. of students that is 60

Just apply in the formula and you will get the answer