A group of nine college students were asked how many hours t…

A group of nine college students were asked how many hours they slept the previous night. The number of hours they slept are:      7     6     7.25     8.5     5      7      6.75     6    9 [a].  Find the mean.  Round to two decimal places. [b].  Find the median.  Round to two decimal places.    [c].  The standard deviation of the hours slept is 1.24 hours. What is the z-score for the student who slept 7 hours?  Round to two decimal places.      

The blows per six inches for an SPT test results are reporte…

The blows per six inches for an SPT test results are reported by your drillers as follows: (A) 50/3″, WOH (B) WOH, 50/3″ (C) 49, 48, WOH (D) 36, WOH You immediately note that one of the SPT N values reported is incorrect. That incorrect SPT N value is A, B, C or D?

Adult Americans (18 and older) were asked whether they use s…

Adult Americans (18 and older) were asked whether they use social media regularly. The following table is based on the results of the survey. What is the probability the person does not use social media given that they were between the ages 18 and 34?  Round your answer to three decimal places.   18-34 35-44 45-54 55+ Use social media 117 89 83 49 Do not use social media 33 36 57 66