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What is the answer to this problem 7 * 5/6

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

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”?