X=-14
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Answer:

Step-by-step explanation:
Assuming a mean of $204 per night and a deviation of $55.
a. What is the probability that a hotel room costs $225 or more per night (to 4 decimals)?
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean"
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Let X the random variable that represent the cost per night at the hotel, and for this case we know the distribution for X is given by:
Where
and 
And let
represent the sample mean, the distribution for the sample mean is given by:

We are interested on this probability

And the best way to solve this problem is using the normal standard distribution and the z score given by:

If we apply this formula to our probability we got this:


And we can find this probability on this way:

-2x^2-8 is the answer good luck
Answer:
(7.5 , -2.5)
Step-by-step explanation:
Sub the values into this formula
Answer:
14 slices
Step-by-step explanation:
First, for simplicity, find the total number of slices.
7*8=56 slices
Now, multiply that by 75%, or .75.
56*.75=42 slices
Finally, to find the ones not eaten, subtract 42 from 56.
56-42=14 slices