Habitat for Humanity built 67 houses in North Carolina in a year. If this was a little under what they normally
are able to do, how many houses (h) are usually built
in a year given that 4 more than three-fourths as many
houses as normal were built?

Ineed to know the answer to this algebra question.

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Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?