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LuckyWell [14K]
3 years ago
13

salaries of nurses in southern california are normally distributed with a mean of $6250 and a standard deviation of $250. what i

s the probability the mean salary of 25 randomly selected nurses is below $6150 or is above $6350 a month
Mathematics
1 answer:
cestrela7 [59]3 years ago
3 0

Step-by-step explanation:

z-score of X = 6150

\frac{6150 - 6250}{250}   =  - 0.4 \\

z-score of X = 6350

\frac{6350 - 6250}{250}  =  - 0.4

P(X<6150) + P(X>6350)

=P(z<-0.4) + P(z>-0.4)

=0.3446+0.3446

=0.6892

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