Question

002- Wand Statistics Bio Page Teaching * Test Information Description Instructions Timed Test This test has a time limit of 1 hour and 40 minutes. You will be notified when time expires, and you may continue or submit Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain Multiple Attempts Not allowed. This test can only be taken once Force Completion This test can be saved and resumed later. The timer will continue to run if you leave the test. This test does not allow backtracking Changes to the answer after submission are prohibited. Assessments Remaining Time: 1 hour, 03 minutes, 07 seconds. Question Completion Status: > Moving to the next question prevents changes to this answer Question 6 of 24 upport ant Online Question 6 5 points Save Answer The average time spent sleeping in hours) for a group of healthy adults can be approximated by a normal distribution with a mean of 6 5 hours and a standard deviation of 1 hour. Between what two values does the middle 90% of the sleep times lie? 5.464 and 7.536 4.855 and 8.145 5.658 and 7.342 5.218 and 7.782 Moving to the next question prevents changes to this answer. Question 6 of 24 >

Answer 1

use this empirical rule

On a normal distribution, about 68% of data will be within one standard deviation of the mean, about 95% will be within two standard deviations of the mean, and about 99.7% will be within three standard deviations of the mean.

here we will take for 95% i.e

mean± 2 S.D, where S.D is the standard deviation.

6.5-2(1)=4.5 , 6.5+2(1)= 8.5so option B will be correct for 90% interval.

So the middle 90% value lier in (4.855, 8.145).