The public library surveyed 220 people about their favorite type of movie. If 25% of the people chose documentaries, how many people chose documentaries?

55 people.

Step-by-step explanation:

Multiply 220 by the percentage in decimal form. To make any percentage to a decimal, simply move the decimal 2 spaces to the left. Now instead of 25, you have 0.25. Multiply this by 220 to get 55. Hope the Helps!

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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: