Arandom sample of 36 trucks traveling on a section of an interstate showed an average speed of 71 mph. the distribution of speeds of all trucks on this section of highway is normally distributed with a standard deviation of 10.5 mph. the value to use for the standard error of the mean is:

1.75

Step-by-step explanation:

The formula to find the standard error is given by :-

Given : The sample size : n = 36

The distribution of speeds of all trucks on this section of highway is normally distributed with standard deviation :

Then , the standard error of the mean  will be :-

Hence, the value to use for the standard error of the mean is : 1.75

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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part 1 answer = 8

part 2 answer = 72

step-by-step explanation:

part 1 explanation = add all of the numbers, then divide by how many numbers you have. so, 200/25 = 8.

part 2 explanation = not gonna lie, this is hard to explain, so just google how to do it.