Kiran shops for books during a 20% off sale. Write an equation that relates the sale price, s, to the original price p.
1 answer:
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For a function of , the average rate of change can be found as follows:
So, this problem asks for the Average Rate of Change of from
to
. In this way, we need to find
. As you can see above, we have the graph of
, so we can find these values. Thus, from the graph:
Therefore:
Answer:
And the explanation of this number is:"The number of text messages for Kendra it's 2.26 deviations above the mean"
Step-by-step explanation:
1) Previous concepts
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".
2) Calculate the z score
Let X the random variable that represent the number of text messages per month, and for this case we know the distribution for X is given by:
Where and
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 the explanation of this number is:"The number of text messages for Kendra it's 2.26 deviations above the mean"