Jennifer earned $50 from her part time job. She wants to put $15 of her earnings into a savings account. She spends $24.99, including tax, on a new hardcover book, but also wants to buy some new bookmarks. If each bookmark costs $1.75, including tax, what is the maximum number of bookmarks she can buy?

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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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12 cups   is the answer

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