The ages of students in a school are normally distributed with a mean of 15 years and a standard deviation of 2 years. Approximately what percent of the students are between 14 and 18 years old? 24.17% 62.47% 30.85% 93.32%

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The ages of students in a school are normally distributed with a mean of 15 years and a standard deviation of 2 years. Approximately what percent of the students are between 14 and 18 years old? 24.17% 62.47% 30.85% 93.32%

Mathematics
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Well, we have : mean = 15 years SD = 2 years let be F the distribution of the N(0,1) is the z-table, then P( 14 < Age < 18) = P( - 0.5 < (Age - mean)/SD < 1.5) = F(1.5) - F( -0.5) = .93319 - .30854 -----------------------> P( 14 < Age < 18) = .62465 second answer
B. 62.47

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Wait wait wait, Can someone tell me exactly how to do this as i have 2 more questions like this one and i should probably figure out how to do them properly
Pizza delivery times at Pizza Time are normally distributed with a mean time of 27 minutes and a standard deviation of 3 minutes. Approximately what percent of pizzas are delivered between 24 and 30 minutes? 32% 68% 95% 99.7%
this is the next one i have to do.

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