The first six rows of Pascal's triangle are shown. David decided to add the numbers in each ron. He found the sum of the first row was 1.t the second row was 2. and the sum of the third row was 4 1 1 1 1 2 1 3 3 1 6 4 1 10 10 5 1 1 1 1 5 Based on the pattern in the triangle, what is the sum of the numbers in the seventh row what is the sum of the seventh row

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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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2,160 π

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