Question

Q- 5 Calculate the mean, variance and standard deviation for the following distribution:
Class
30-40
40-50
50-60
60-70
70-80
80-90
90-100
Frequency
7
12
15
8
3
2
Please no unrelated answers ​

Answer 1

$hello \: \: sister \: \: check \: \: your \: \: question \: first$