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Vikki [24]
3 years ago
9

The average speed of a car driving down freeway is 70mph with a standard deviation of 5mph. Thid speed is normally distributed.

Find the following.A) what is the probability that a randomly selected car is driving more than 77mph?B) what is probability that a randomly selected car is driving between 65 and 69 mph?C) what is the probability that a randonly selected car is driving between 67 and 77mph?D) what is the probability that a randomly selected car is driving less than 77mph?
Mathematics
1 answer:
ikadub [295]3 years ago
5 0

Answer:

0.081,0.2621,0.645,0.919

Step-by-step explanation:

Let X be the average speed of a car driving down freeway

Given that X is normal with mean as 70mph with a standard deviation of 5mph.

To convert to Z score we do

Z =\frac{x-70}{5}

a)  the probability that a randomly selected car is driving more than 77mph

=P(X>77)\\=P(Z>1.4)\\=0.081

b) probability that a randomly selected car is driving between 65 and 69 mph

= P(-1

c) the probability that a randonly selected car is driving between 67 and 77mph

=P(-0.6

d) the probability that a randomly selected car is driving less than 77mph

=P(Z

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