Darlene read 35 pages of the book.
Answer:
E(X) = 17.4
Step-by-step explanation:
We can calculate the expected value of a random X variable that is discrete (X takes specific values ) as:
E(X) = ∑xp(x) where x are the specific values of x and p(x) the probability associated with this x value.
In this way the expexted value is
E(X) = ∑xp(x) =(16*0.6)+(18*0.3)+(20*0.2) = 8+5.4+4 = 17.4
Answer:
a 87
b 814
Step-by-step explanation:
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Of means multiply, so it would be 40% x 64
40% is equivalent to 0.40, so you would use the equation
C. 0.40(64) = n
(2x+7)+(3x+58)=90
5x+65=90
5x=25
x=5
