for children in a certain range, heights are normally distributed with a mean of 25

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for children in a certain range, heights are normally distributed with a mean of 25 inches and a standard deviation of 2.1 inches. if one child in this age range is selected at random what's the probability that:

a. He/She will be over 27 inches tall?

b. he/she will be under 23 inches tall?

c. he/she will be between 24.5 and 25.5 inches tall?