In the back of your statistics text, there is a table labeled something like "areas under the normal distribution." Look for the portion values for the longer or smaller portion to get your Z score.
I really hope this helps you :)
Answer:
negitive
Step-by-step explanation:
<u>Given</u>:
The cost for the children’s party at the rollerskating rink is a function of n, the number of people in the party. The cost function, C is given by
![C(n)=\left\{\begin{array}{ll}150, & 0](https://tex.z-dn.net/?f=C%28n%29%3D%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bll%7D150%2C%20%26%200%3Cn%20%5Cleq%2012%20%5C%5C260%2C%20%26%2012%3Cn%20%5Cleq%2020%20%5C%5C400%2C%20%26%2020%3Cn%20%5Cleq%2030%5Cend%7Barray%7D%5Cright.)
We need to determine the cost to have a party with 9 people and the cost to have a party with 20 people.
<u>Cost of having the party:</u>
From the given function, the cost of having the party for 9 people lies in the interval
Hence, the cost of having the party for 9 people is 150.
Also, from the function, the cost of having the party for 20 people lies in the interval ![12](https://tex.z-dn.net/?f=12%3Cn%20%5Cleq%2020)
Hence, the cost of having the party for 20 people is 260.
Answer:
(86+94+88+95+89+x)/6 = 90
Step-by-step explanation:
use calculator to add the scores, cross multiply (6 × 90) solve for x