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V125BC [204]
3 years ago
8

Find the standard deviation. Round to the nearest tenth when necessary.

Mathematics
1 answer:
stepladder [879]3 years ago
4 0

Answer:

d.    S.D=      7.3

Step-by-step explanation:

x                       f                   f(x)                    x²                  f(x²)

75                     2                  150                 5625             11250

80                     3                  240                6400              19200

85                     2                  170                 7225               14450

90                     2                   180                8100               16200

95                      0                    0                 9025                  0

100                    1                     100             10000              10000

Sum               f=   10           fx=  840                             f(x²) = 71,100

Standard Deviation = √Sum fx² - (Sum f(x))²/sum f/ f

S.D= √71,100- (840)²/10/10

S.D= √71,100- 70560/10

S.D= √540/10

S.D= √54

S.D= 7.348 ≅7.3

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