Answer to Question #222914 in Statistics and Probability for Mustafa Zaidi

Question #222914

Family incomes have a mean of $60 000 with a standard deviation of $20 000. The data are normally distributed. Determine the probability that a randomly selected family has a family income less than $36 000. Include evidence of your work by typing out your solution fully.


1
Expert's answer
2021-08-04T11:18:45-0400

Solution:

Given:

μ=60000\mu=60000

σ=20000\sigma=20000

P(X<36000)=P(Z<360006000020000)P(X<36000)=P(Z<\frac{36000-60000}{20000})

=P(Z<1.2)=P(Z>1.2)=1P(Z1.2)=10.88493=0.11507=P(Z<-1.2)=P(Z>1.2)=1-P(Z\le1.2) \\=1-0.88493 \\=0.11507

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