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.

Areflection of shape i across the y-axis, followed by a , and then a translation left 6 units and down 4 units confirms congruence between shape i and shape ii. alternatively, a of shape ii about the origin, followed by a reflection across the y-axis, and then a translation right 4 units and up 6 units confirms congruence between shape ii and shape i.