I am a bit lost on how my teacher got the answers for the stuff not circled in blue. Can anyone explain it to me? Thanks. I will reward more points to whoever explains it the best.

452,489 to the nearest thousand is 452,000

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:

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step-by-step explanation:

4n=2m

ratio of m to n: 2/4 = 1/2

answer

a. 1/2