Answer:
THE THIRD ONE
Step-by-step explanation:
Sorry this took so long! I managed to do everything except for the parts involving standard deviation. (I tried but I couldn't quite figure it out.)
~Hope this helps!~
Answer:
-7/45
Step-by-step explanation:
First, find the lowest common denominator for 9 and 15. It's 45. Make both fractions over 45 by multiplying the top and bottom by the same number.

Since 15*3=45, multiply the top by 3 also. Since 9*5=45, multiply the top by 5 also.

Combine the fractions
Answer in lowest terms
Answer:
31 and a quarter week (31.25)
Step-by-step explanation:
First find the rate. There is no need to do cross multiplication because it's already a unit rate (per 1 week).
2. Divide
156.25 / 5 = 31.25
3. Answer
31.25 weeks