3. A discrete random variable X has the following probability distribution: 77 78 79 80 81
P) 0.15 0.15 0.20 0.40 0.10

Compute each of the following quantities.
a. P(80)
b. P(X > 80).
c. P(X S80).
d. The mean p of X.
e. The variance a? of X.
f. The standard deviation o of X.

i got 142 as my answer

step-by-step explanation:

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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