Question

Find out standard deviation of the savings of the following 10 persons by direct method
X
1
2
3
4
5
6
7
8
9
10
F
114
108
100
98
101
109
117
119
121
126
​

Answer 1

Answer:

:

Here,

Highest value (H)= 35

Lowest value (L) = 15

Range= Highest value − Lowest value

i.e. R= H− L

Substituting the given values in the formula

R= 35 − 15= 20

Coefficient of Range is as follows:

CR =

H-L

H+L

or, CR =

35-15

35+15

=

20

50

⇒ CR =0.4

Hence, the range (R) of the above data is 20 and coefficient of Range (CR) is 0.4

Answer 2

Question is solve by direct method