SOLUTION: The average annual salary for all U.S. teachers is $47,750. Assume that the distribution is normal and the standard deviation is $5680. Find the probability that a randomly selecte
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Question 1160535: The average annual salary for all U.S. teachers is $47,750. Assume that the distribution is normal and the standard deviation is $5680. Find the probability that a randomly selected teacher earns more than $38,000 a year Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
want z> (38000-47750)/5680 or z>-1.716
this probability is 0.9569
on calculator can do 2nd VARS 2 normalcdf (38000, 200000,47750,5680) ENTER
the 200000 is an arbitrary large number. You can use 1E99 or anything more than about 6 sd from the mean.
