Answer: Its the 4th choice
Step-by-step explanation:
-12 + 8 = -4
Answer: 
Step-by-step explanation:
Let
represents the standard deviation .
Given : Last year, the standard deviation of the ages of the students at UA was 1.8 years.
The researcher are interested in testing to see if there has been a significant change in the standard deviation of the ages of the students at UA.
We know that the null hypothesis always contains the equal signs, then the null and alternative hypothesis is given by :-

Answer:
n = 9
Step-by-step explanation:
divide 45 by 5 to find n
45/5 = 9
Answer:
<u>-21+7r</u>
Step-by-step explanation:
<span> i think that -1 is the answer </span>