Work probability problems?

Jaun has $1.50 in change in a jar. There are 15 nickels, 5 dimes, and 25 pennies. If he randomly selects one coin, what is the probability of selecting a dime on the first try?
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suppose annual slaries of workers in x county are normally distruted with a mean of $54000 and SD of $9000

A)what is probability of finding a group of 5 workers in santa clara making an average of more than $60000

B)What is the average salary corresponds to the 90th percentile for a group of 10 workers in X county ?
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