The Oregon Fisheries Commission monitors the size of the salmon that climb the fish ladder at Bonneville

Question:

The Oregon Fisheries Commission monitors the size of the salmon that climb the fish ladder at Bonneville Dam on the Columbia River every year. The Commission described the length of the salmon observed during the past year with a normal having a mean of 78 cm and a standard deviation of 18 cm. What percentage of the salmon were
a. Less than 50 cm in length?
b. Between 70 cm and 100 cm in length?
c. At least 95 cm in length?
d. Between 90 cm and 115 cm in length? Distribution
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