The ratio of girls to boys in the school chorus is 2: 3. there are 60 students in the chorus. how many are boys?

36

Step-by-step explanation:

Girls = 2

Boys = 3

2 + 3 = 5

60 / 5 = 12

Girls = 2 x 12 = 24

Boys = 3 x 12 = 36

24 + 36 = 60

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

your answer is -9

step-by-step explanation: