Essica and her sister, Nicole, need money for lunch. Jessica receives $50 and buys lunches at the high school for $2.50 each and
2 answers:
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Answer:
a)
b) First we need to calculate the variance given by this formula:
And the deviation would be:
c)
And using the cdf we got:
d)
Step-by-step explanation:
For this case we define the random variable X who represent the customers charge, and the distribution for X on this case is:
Part a
For this case the average is given by the expected value and we can use the following formula:
Part b
First we need to calculate the variance given by this formula:
And the deviation would be:
Part c
For this case we want to find the percent between 600 and 889, so we can use the cumulative distribution function given by:
And we can find this probability:
And using the cdf we got:
Part d
And using the cdf we got: