The data from medicine described in exercise 8.3.4 considered ice hockey player performance after electrostimulation training. in summary, there were 17 players, and the sample standard deviation of performance was 0.09 seconds. a. is there strong evidence to conclude that the standard deviation of performance time exceeds the historical value?

-2 is the right

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

happy to

pls mark as brainliest