Jana is making greeting cards that are 4 inches long and 3.5 inches wide to sell at a craft fair. she decorates each card by putting a strip of red ribbon along the border all the way around the card.

15 inches of ribbon is needed.

Step-by-step explanation:

To find how much ribbon is needed to go around the edge of the card, find the perimeter. The perimeter is the length around the card.

Perimeter is found by P = 2l + 2w where w=3.5 and l=4.

P = 2(4) + 2(3.5)

P = 8 + 7

P = 15 inches

15 inches of ribbon is needed.

the answer is y = 11.54

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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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