What can i help you with?
Answer:
1.5
Step-by-step explanation:
The mean is the Middle number.
1 standard deviation in both sides of 7.5 makes it between 6 and 9.
<u>What is the </u><u>"common difference"</u><u> in 6 to 7.5 and from 7.5 to 9?</u>

and

So, we would say the standard deviation is 1.5
Answer choice A is right.
Answer:
-5c
Step-by-step explanation:
c+c-7c > 2c-7c = -5c
Answer:
150
Step-by-step explanation:
159 rounded to the nearest tenth is 160
160-10=150