The dot plot below shows the average fuel efficiency of a number of mid- size sedans for a particular year model. the variability of each year model's average miles per gallon is 1.68. the difference between the median miles per gallon each year model's line up is approximately how many times the variability? a. 4 b. 7 c. 6 d. 3

addition

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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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depends what are you allowed to do ?