On a popular app, users rate hair salons as 1, 2, 3, 4, or 5 stars. Suppose a rating is randomly selected from all the ratings on the app. Let X be the number o stars of the selected rating. Here is the probability distribution of X. Value x of X 1 2 3 4 P(X=x) 0.25 0.19 0.09 0.21 0.26 For parts (a) and (b) below, find the probability that the randomly selected hair salon rating has the described number of stars.
On a popular app, users rate hair salons as 1, 2, 3, 4, or 5 stars. Suppose a rating is randomly selected from all the ratings on the app. Let X be the number o stars of the selected rating. Here is the probability distribution of X. Value x of X 1 2 3 4 P(X=x) 0.25 0.19 0.09 0.21 0.26 For parts (a) and (b) below, find the probability that the randomly selected hair salon rating has the described number of stars.
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Transcribed Image Text:On a popular app, users rate hair salons as 1, 2, 3, 4, or 5 stars. Suppose a rating is randomly selected from all the ratings on the app. Let X be the number of
stars of the selected rating. Here is the probability distribution of X.
Value x of X
1
2
3
4
5
P(X=x)
0.25
0.19
0.09
0.21
0.26
For parts (a) and (b) below, find the probability that the randomly selected hair salon rating has the described number of stars.
(a) More than 3: ||
(b) At most 2:
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