Question

in English course, students had to turn in final paper. the mean grade earned by the class was 80./1 with a standard deviation 0f 2.8 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?

Answer 1

Given,

= 80.1 , = 2.8

According empirical (69-95-99.7) rule,

Approximately, 68% data falls in 1 standard deviation of the mean.

That is 68% data falls in - 1 * and + 1 *

Between 80.1 - 2.8 and 80.1 + 2.8

Between 77.3 and 82.9

Therefore, values of A and B are 77.3 and 82.9 respectively.

Value of A = 77.3