I’m not sure how to answer this question but I worked like to know why I got it wrong. My school is doing online stuff now so to corona virus

Formula for area of a circle is A = PI x r^2

Area of outside circle = 3.14 x 5^2 = 3.14 x 25 = 78.5

Area of inner circle = 3.14 x 2.5^2 = 3.14 x 6.25 = 19.625

Area of shaded region = outside circle - inner circle = 78.5 - 19.625 = 58.875 = 59 m

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: