probability---normal distribution

population size=50
population mean= 80m
standard deviation = 0.70m

what proportion would have average meter of 89 or more?

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now I know how to solve this problem if the question is worded "what proportion would have average meter Greater than 89?" but since this question ask for the proportion that is greater than and inclusive of 89 I am not sure if I should still workout and look up z value in the normal distribution (u=0, sigma=1)table.Maybe I should use a different table? or a different formula?

Help please!

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