To find the mean (or average), we will use the following formula:

\(\displaystyle \text{mean} = \frac{\text{sum of numbers within set}}{\text{number of numbers within set}}\)

So, given the set

\(\displaystyle 78, 95, 84, 81, 93, 88, 83\)

we can calculate the following:

\(\displaystyle \text{sum of numbers within set} = 78+95+84+81+93+88+83\)

\(\displaystyle \text{sum of numbers within set} = 602\)

We can also calculate the following:

\(\displaystyle \text{number of numbers within set} = 7\)

because there are 7 numbers in the data set.

So, we can substitute. We get

\(\displaystyle \text{mean} = \frac{602}{7}\)

\(\displaystyle \text{mean} = 86\)

Therefore, the mean of the data set is 86.

To find the mean, we will use the following formula:

\(\displaystyle \text{mean} = \frac{\text{sum of numbers within set}}{\text{number of numbers within set}}\)

Now, given the set

\(\displaystyle 77, 75, 88, 81, 93, 86, 80, 92, 84\)

We can calculate the following:

\(\displaystyle \text{sum of numbers within set} = 77+75+88+81+93+86+80+92+84\)

\(\displaystyle \text{sum of numbers within set} = 756\)

We can also calculate the following:

\(\displaystyle \text{number of numbers within set} = 9\)

because if we count, we can see there are 9 numbers in the set.

So, we can substitute. We get

\(\displaystyle \text{mean} = \frac{756}{9}\)

\(\displaystyle \text{mean} = 84\)

Therefore, the mean score is 84.

The mean is the average of all the numbers in the data set.

Add all the numbers and divide the total by four.

\(\displaystyle \frac{-1+(-2)+5+8}{4} = \frac{10}{4}\)

Reduce the fraction.

The mean is:  \(\displaystyle \frac{5}{2}\)

The mean is the average of all the numbers in the set of numbers.

Add the numbers and divide the quantity by four.

\(\displaystyle \frac{-5+(-6)+9+14}{4} = \frac{12}{4} = 3\)

The mean is:  \(\displaystyle 3\)

The mean is the average of all the numbers in the data set.

Sum all the numbers and divide the quantity by 4.

\(\displaystyle \frac{-9+(-6)+12+13}{4} = \frac{10}{4} = \frac{5}{2}\)

The answer is:  \(\displaystyle \frac{5}{2}\)

To figure out this problem, you must first calculate the total pounds in the elevator.

The first group is:

\(\displaystyle 9*157\) or \(\displaystyle 1413\) lbs.

The second group is:

\(\displaystyle 2*177\) or \(\displaystyle 354\) lbs.

Thus, the total amount is:

\(\displaystyle 354+1413=1767\)

Thus, the average weight in the elevator will be:

\(\displaystyle \frac{1767}{11}\) (Remember, there are now \(\displaystyle 11\) people in the elevator.)

This is \(\displaystyle 160.63636363636364\) or \(\displaystyle 160.64\) lbs.

Sum all the numbers and divide the quantity by 6.

\(\displaystyle \frac{(1+5+9+11+24+26)}{6} = \frac{76}{6}\)

Reduce this fraction.

The answer is:  \(\displaystyle \frac{38}{3}\)

The mean is the average of all the numbers in the data set.

Add all numbers and divide the total by five.

\(\displaystyle \frac{2+8+10+(-2)+20}{5} = \frac{38}{5}\)

The answer is:  \(\displaystyle \frac{38}{5}\)

The mean is the average of all the numbers.

Add all the numbers and divide the sum by 6.

\(\displaystyle \frac{8+9+(-4)+(-3)+15+2}{6} = \frac{27}{6}\)

Reduce this fraction.

The answer is:  \(\displaystyle \frac{9}{2}\)

Charlie's lowest score was a 50, so his grade was the mean of 68, 77, 73, and 80, which is the sum of the scores divided by the number of scores, 4;

\(\displaystyle \frac{68+77+73 + 80}{4} = \frac{298}{4}= 74.5\)

\(\displaystyle 70 \le 74.5 < 80\),

so Charlie made a grade of "C".