1 : Mike bought a couch for $875. 6% sales tax is added. How much will Mike need to pay total for the couch? 2 : Bill left an 18% tip on a $15.80 lunch bill. How much did he leave for the tip?

3 : A $22 video game is discounted by 25%. How much is the game after the discount?

4 : Sal is a car salesman. He sold $95,980 worth of cars last month. If he makes 3.5% commission, how much money will he take home?

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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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