Birds at the birdbath between 9 A. M. And 10 A. M. On Monday: 4 cardinals, 8 chickadees, 3 mockingbirds, and 2 thrashers How many birds are at the birdbath between 9 A. M. On Monday and 9 A. M. On Tuesday?

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b) 62.47% of the students are between 14 and 18 years old.

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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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