Question: The marks in an economics class are normally distributed, with a mean of 65% and a standard deviation of 12%. a. What percentage of the

The marks in an economics class are normally distributed, with a mean of 65% and a standard deviation of 12%.
a. What percentage of the class passed (that is, received a mark of 50% or higher)?
b. What percentage of the class received a mark of 45% or lower?
c. What percentage of the class received a mark between 50% and 75%?
d. What percentage of the class received a mark of 90% or higher?

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