3x + 14 – x + 112 and 4x + 134 yes?
2 + 6x and 2(3x + 1) yes?
3(x + 1) – (1 + x) and 2x + 3 yes?
3x and 4(x + 1) – x – 4 yes?
5.5 + 2.1x + 3.8x – 4.1 and 1.4 + 5.9x yes?

step-by-step explanation:

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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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