The mean score on an exam is 500 with a standard deviation of 100. Ninety-five p

Question

The mean score on an exam is 500 with a standard deviation of 100. Ninety-five percent of the test takers score above what? 260 336 405 414 A trucking firm determines that its fleet of trucks averages a mean of 12.4 miles per gallon with a standard deviation of 1.2 miles per gallon on cross-country What is the probability that one of the trucks averages more than 10 miles per gallon? 0.0082 0.0228 0.4772 0.5228 0.9772 Click Save and submit to save and submit. Click Save All Answers to save all answers.

Explanation / Answer

Solution:-

9. option b. 336

   Explanation:-
If we want 95% of the bell curve to the right of a score,  I get a z-score of -1.645. So that score is -1.645 standard deviations below the mean.

-1.645*100 + 500 = 335.5 ~ 336

10. option b. 0228

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.