A speed camera takes two photographs of a car. Photo 1: 0.8m
Photo2: 0.8m

Photo 2 was taken 0.5 seconds after Photo 1.
Marks on the road are 0.8 metres apart.

Calculate the average speed of the car in m/s.

0.8m/0.5s = 1.6 m/s

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yes

step-by-step explanation:

yes

hello,

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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