Question

Find out the standard deviation of the following by step deviation method-
Marks No. Of students
20-40 - 6
40-60 - 9
60-80 - 8
80-100 - 10
100-120 - 11
120-140 - 6​

Answer 1

• -26
• -29
• -28
• -30
• -31
• -26
• This is the answer

Answer 2

Answer:

180

450

560

900

1210

780