Question

solve the problem.....​

Answer 1

arithmetic mean= sum of terms/ number of terms

=6+11+10+8+5/5

=40/5

=8

I hope it helps you!!

Answer 2

Answer:

56/3 marks

Step-by-step explanation:

If all of the marks are unknown, we take the mean of each distribution.

Doing in that way will reduce the standard deviation(of each frequency), the lower the better.

First, mean value of each frequency is 5,15,25,35,45.

Expected sum is found by multiplying the frequencies.

The mean is 560 over 30, 56/3.