First we can add 150 + 50 = 200.
Then we can subtract 75 from that to get 125.
Now our equation is 125 + ? = 0.
What we have to do is add -125 to get zero.
So ? = -125.
Hope this helps!

8 0

4 years ago

Read 2 more answers

Addicted to the Internet?The Ann Arbor public school officials would like to estimate the population mean daily Internet usage t

Lana71 [14]

Answer:

We can assure the Ann Arbor officials that after look the information we conclude that the mean is 8 h

Step-by-step explanation:

From CI ( 95 % ) = ( 6,7 ; 9,3 )

And the information "large random size sample" we conclude that the population has a normal distribution; a normal distribution has a bell shape curve, and data must spread symmetrically with respect to the mean, therefore the mean is:

6,7 + 9,3 = 16

16/2 = 8

If we need t check we can use the other CI

CI ( 99 % ) = (6,257 , 9,743 )

6,257 + 9,743 = 16

16/2 = 8

We are sure the mean is 8 h

6 0

3 years ago