The following table gives marks scored by students in an examination. Calculate the mean marks correct to 2 decimal places. It is 25 sum
Answers
Given : marks scored by students in an examination
To find : Calculate the mean marks correct to 2 decimal places.
Solution:
Convert cumulative frequency into normal frequency
Marks Mean Marks f A = (mean - 22.5)/5 fA
0 - 5 2.5 3 -4 - 12
5 - 10 7.5 7 -3 - 21
10 - 15 12.5 15 -2 - 30
15 - 20 17.5 24 -1 - 24
20 - 25 22.5 16 0 0
25 - 30 27.5 8 1 8
30 - 35 32.5 5 2 10
35 - 40 37.5 2 3 6
80 -63
Mean = 22.5 + 5 ( - 63) / 80
= 22.5 - 3.9375
= 18.5625
= 18.56
18.56 is the Mean
Learn more:
Find the mean height of 12 members of a family. heights 5cm, 5.2cm ...
https://brainly.in/question/13772519
find the sum of 12 number whose mean is 11 - Brainly.in
https://brainly.in/question/7957119