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.

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

What is 140% of 25? because i need