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Title: The average time spent sleeping (in hours) for a group of medical residents at a hospital can be ... Post by: Catracho on Jan 9, 2019 The average time spent sleeping (in hours) for a group of medical residents at a hospital can be approximated by a normal distribution, as shown in the graph to the right. Answer parts (a) and (b) below.
Title: Re: The average time spent sleeping (in hours) for a group of medical residents at a hospital can ... Post by: bolbol on Jan 9, 2019 a)
1.645 = (X - 6.1)/1 X = 1.645 + 6.1 X = 7.745 or 7.75 on rounding to 2 dps Shortest sleeping time that place a resident in the top 5% of is 7.75 hours b)Between what two values does the middle 50% of the sleep times lie? The z values concerned are - 0.675 and + 0.675 - 0.675 = (X - 6.1)/1 X = 6.1 - 0.675 X = 5.425 or 5.43+ 0.675 = (X - 6.1)/1 X = 6.1 + 0.675 X = 6.775 or 6.78 Middle 50% sleep times lie between 5.43 hours and 6.78 hours Title: Re: The average time spent sleeping (in hours) for a group of medical residents at a hospital can ... Post by: Catracho on Jan 11, 2019 a) 1.645 = (X - 6.1)/1 X = 1.645 + 6.1 X = 7.745 or 7.75 on rounding to 2 dps Shortest sleeping time that place a resident in the top 5% of is 7.75 hours b)Between what two values does the middle 50% of the sleep times lie? The z values concerned are - 0.675 and + 0.675 - 0.675 = (X - 6.1)/1 X = 6.1 - 0.675 X = 5.425 or 5.43+ 0.675 = (X - 6.1)/1 X = 6.1 + 0.675 X = 6.775 or 6.78 Middle 50% sleep times lie between 5.43 hours and 6.78 hours it was incorrect !!!!!!Title: Re: The average time spent sleeping (in hours) for a group of medical residents at a hospital can . Post by: bio_man on Jan 11, 2019 Content hidden
Title: Re: The average time spent sleeping (in hours) for a group of medical residents at a hospital can ... Post by: bio_man on Jan 11, 2019 b)Between what two values does the middle 50% of the sleep times lie? Where did you find this question? |