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In 2016, a sample of Habitat for Humanity International (HFHI) local chapters built and donated on average 278 homes with a standard deviation of 42 homes.If "the number of homes built in 2016" was normally distributed, what percentage of the HFHI local chapters in the sample built:

Z score(s) Area (%)

a. more than 300 houses?___________

b. between 230 and 278 houses?___________

What is the probability that a randomly selected HFHI chapter built?

Z score(s)Probability

c. less than 289 homes?___________

d. more than 250 homes?___________