Brittany surveyed the students in three different chemistry classes regarding the average number of hours of sleep they get each night. she calculated the mean and standard deviation, sd, of the data and recorded the results in the table below. class a mean = 7.35 sd = 2.92 class b mean = 6.87 sd = 3.65 class c mean = 8.14 sd = 3.10 use the information provided to complete the following statement. class ( a, b, c) shows the most consistency in the number of hours slept per night because the(standard deviation, mean) is the (highest, lowest).

Class A shows the most consistency in the number of hours slept per night because the standard deviation is the lowest.

Step-by-step explanation:

The standard deviation of a set measures how close the measures of this set are, that is, how consistent they are.

The lesser the standard deviation is, the higher the consistency is.

In this problem, we have that:

Class A has the lowest standard deviation.

So:

Class A shows the most consistency in the number of hours slept per night because the standard deviation is the lowest.

step-by-step explanation:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

step-by-step explanation:

given that megan owns a clothing boutique.

the profits of 2010, 11, are recorded and shown as follows:

years since     2010 0     1     2     3       4       5

profits made in 1000's   39       84     111     120   111     84

we find that profit gradually increases form 2010 to 2013 upto 120,   then starts decreasing.

the profits for 2012 and 2014 are the same while that of 2011 and 2015 are also the same.

this shows that there is symmetry about the line profit = 120000

hence answer is:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

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c

step-by-step explanation: