The marks scored by 10 students in a class test are 25, 29, 30, 33, 35, 37, 38, 40, 44,
48. Find the standard deviation
Answers
Answer:
6.67
Step-by-step explanation:
mean = ∑x/n
= 25+29+30+33+35+37+38+40+44+48/10
=359/10
=35.9 = 36
x d = x-mean d^2
=x-36
25 -11 121
29 -7 49
30 -6 36
33 -3 9
35 -1 1
37 1 1
38 2 4
40 4 16
44 8 64
48 12 144
∑d= -1 ∑d^2= 445
S.D=√445/10 - (-1/10)
=√44.6
=6.67