Question

Calculate (a) Mean (b) Variance and (c) Standard deviation from the following frequency
distribution
Class; Frequency
1-10 ; 11
10-20 ; 29
20-30 ; 18
30-40 ; 4
40-50 ; 5
50-60 ; 3​

Answer 1

Answer:

60 70 20 ans

Step-by-step explanation:

answer dekh