Question

What is the mean of the set of numbers?


{–9, –8, 4, –1}


A.
–5.5

B.
–3.5

C.
–2.8

D.
14
Question Resources

Answer 1

The mean (or the average), is found by adding all the numbers in the set, and dividing by the number of these numbers.

Answer 2

In your case:

\(\mu =\dfrac{(-9)+(-8)+(4)+(-1)}{4}\)

where \(\mu\) denotes the mean.

Answer 3

the answer is 4

Answer 4

What is the sum of all elements in your set, can you find that for me?

Answer 5

(-9) + (-8) + (4) + (-1) = ?

Answer 6

-14

Answer 7

yes, that is right.

Answer 8

so thats the answer

Answer 9

Now, lets get back to finding the \(\mu\) (the mean).

\(\mu =\dfrac{(-9)+(-8)+(4)+(-1)}{4}=\dfrac{-14}{4}=?\)

Answer 10

-3.5

Answer 11

Yes, and this is exactly right!

Answer 12

so that is the final answer

Answer 13

yes

Answer 14

thank you so much

Answer 15

You are welcome!