Answer:

Step-by-step explanation:
To find the scale, we write a ratio of
and simplify.
We know
.
We simplify to 
If a random sample of 20 persons weighed 3,460, the sample mean x-bar would be 3460/20 = 173 pounds.
The z-score for 173 pounds is given by:

Referring to a standard normal distribution table, and using z = 0.66, we find:

Therefore

The answer is: 0.2546
6 because if you multiply (3/5)2 you get 6
It’s the 9 because it’s 3 times 3
the answer is -12/3 cause it's negative