Gowan conducted a science experiment on evaporation using a cone-shaped container. the cone had a height of 3 cm and a radius of 2 cm. he filled the cone with a liquid chemical and recorded the time it took to evaporate, which was 15.7 min.
how much of the liquid chemical evaporated each minute? use 3.14 to approximate pi and express your answer to one decimal place.

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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: