If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the? wind, find the speed of the wind and the speed of the plane in still air.

plane velocity (with wind) = 500 mph

plane velocity (against wind) = 420 mph

velocity difference divided by 2 = 40

plane velocity = 500 - 40 = 460 mph

Step-by-step explanation:

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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: