Step-by-step explanation:
I hope this helps to you....
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
pls mark me as brainliest if satisfied
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Answers & Comments
Step-by-step explanation:
I hope this helps to you....
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
Ans-18.56 is the Mean
pls mark me as brainliest if satisfied