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Answer :
Sample standard deviation is 7.42 .
Given,
Drying times (in minutes) for an adhesive product. 85.7, 101,4, 91.6, 83.5, 96.2, 88.0, 103.6, 97.9 .
Now,
Firstly calculate the mean
Mean = 85.7+ 101.4+ 91.6+ 83.5+ 96.2+ 88.0+ 103.6+ 97.9 /8
Mean = 747.9/8
Mean = 93.4875
Now
Standard deviation,
SD = √1/7 Σ (Xi -X )²
I varies from 1 to 8 .
SD = √1/7 [(85.7 - 93.4875)² + (101.4 - 93.4875)² + (91.6 - 93.4875)² + (83.5 - 93.4875)² + (96.2 - 93.4875)² + (88- 93.4875)² + (103.69 - 93.4875)² + (97.9 - 93.4875)² ]
SD = 7.42
Thus the SD is 7.42 . Option C is correct .
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