Which data set has the same standard deviation as the data set?
(3,2,5,6,8)
a) (4,3,6,7,9)
b) (1,3,4,7,9)
c) (1,2,1,2,1)
d) (4,4,5,5,5)

90

step-by-step explanation:

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers