The graph to the right is the uniform probability density function for a friend who is x minutes late. ​(a) Find the probability that the friend is between 20 and 30 minutes late. ​(b) It is 10 A.M. There is a 10​% probability the friend will arrive within how many​ minutes?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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The graph to the right is the uniform probability density function for a friend who is x minutes late.
​(a) Find the probability that the friend is between
20
and
30
minutes late.
​(b) It is 10 A.M. There is a
10​%
probability the friend will arrive within how many​ minutes?
 
 
 
 
 
 
01020301/300Time (min)Density      X
 
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A probability density function has a horizontal axis labeled "X" and "Time (minutes)" from 0 to 35 in intervals of 5 and a vertical axis labeled "Density" from 0 to one thirtieth. The probability density function is a rectangle from 0 to 30 with a height of one thirtieth.
​(a) The probability that the friend is between
20
and
30
minutes late is
nothing.
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