Approximately 75% of all marketing personnel are extroverts, whereas about 60% of all computer programmers are introverts. a. At a meeting of 10 marketing personnel, i. If ? is the number of marketing...

Approximately 75% of all marketing personnel are extroverts, whereas about 60% of all computer programmers are introverts.

a. At a meeting of 10 marketing personnel,

i. If ? is the number of marketing personnel that are extrovert, write the formula for the probability ?(?).
ii. What is the probability that 3 or more are extroverts?
iii. Find the expected value of marketing personnel that are extroverts.