Estimate whether each sum is closest to 0, 1/2, 1, or 1 1/2.

The sum is closest to 1/2.

Step-by-step explanation:

To simplify it if you make the 1/11 into a 1/10 then it equals 2/10=1/5. 1/5 if way closer to 1/2 than anything else.

49%

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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step-by-step explanation: