6. Tyree planned to build a ramp from his window to the sidewalk so he could skateboard right out his window on his way to school. His window is 5 feet off the ground and the sidewalk is 20 feet from his house. How long will Tyree's ramp need to be to make it from his window to the sidewalk?

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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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step-by-step explanation:

x< 2

step-by-step explanation: