Estimate to determine if the answer is a realistic solution. 1.8 times 16.5 equals 29.7

One possible way of estimating an answer to see if it is a realistic solution is rounding up/down numbers with decimals so you can easily guess!

For example, in this problem, lets round 1.8 up to 2 and 16.5 up to 17.

2 × 17 = 34

34 is not that far from 29.7 !

So, we can say that 29.7 is a realistic solution considering the inclusions of decimals.

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: