In an English course, students had to turn in a final paper. The mean grade earn

Question

In an English course, students had to turn in a final paper. The mean grade earned by the class was 80.1 with a standard deviation of 3.3 points. The scores are approximately bell-shaped. Approximately 68% of all final paper scores were between two values A and B. What is the value of A? Write only a number as your answer. Round to one decimal place. Your Answer: In a sample of Starbucks customers it was found that the number of individual items bought per month at Starbucks was 19 with a standard deviation of 20. Assume the data to be approximately bell-shaped. Approximately 95% of the time, the number of monthly items purchased was between two values A and B. What is the value of B? Write only a number as your answer.

Explanation / Answer

Answer - 11:

According to empirical rule,

Around 68% of the data lie between 1 standard deviation from the mean

So,

A = 80.1 - 3.3

A = 76.8

Answer - 12:

According to empirical rule,

Around 95% of the data lie between 2 standard deviation from the mean

So,

B = 19 + 2(20)

A = 59

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