Ask Question
12 December, 04:30

When Mrs. JHixson gave a test, the scores were normally distributed with a mean of 78 and a standard deviation of 6. This means that 95% of her students scored between which two scores?

A. 72 and 84

B. 66 and 90

C. 60 and 96

D. 60 and 100

+5
Answers (1)
  1. 12 December, 06:55
    0
    For normal distribution 95% lie in the range mean-2*standard deviation for lower bound and mean+2*standard deviation for upper bound.

    Upper bound is 78+2*6=78+12=90

    Lower bound is 78-2*6=78-12=66

    B. 66 and 90
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “When Mrs. JHixson gave a test, the scores were normally distributed with a mean of 78 and a standard deviation of 6. This means that 95% of ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers