The data from Medicine and Science in Sports and Exercise provided ice hockey player perfor mance after electrostimulation training. In summary, there
were 17 players, and the sample standard deviation of performance was
0.09 seconds. Is there strong evidence to conclude that the standard deviation of
performance time exceeds the historical value of 0.75 seconds?

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step-by-step explanation:

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percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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