0.15x + 100
x representing amount of text messages sent or received
Total Cost in a day is
. Profit function is
. And the revenue function is
. In a day, bookstore must sell at least 15 books, because of 6n-90=0, in order to make profit.
Answer:
50*
Step-by-step explanation:
The set given by the project grade is {1, 2, 3, 4, 5}. If the random variable, X, is the project grade, the mean of the probability distribution is determined by:
Sum = 1 + 2 + 3 + 4 +5
= 15
Mean of the probability distribution is 15/n, where n = 5
= 15/ 5
= 3