Convert the percent into a decimal by moving the percent sign by two places to do left. 80% => 0.80.
Then multiply: 90 * 0.80 = 72
Multiply each X by its corresponding probability P, then add up them up.
E[X] = 3•0.2 + 4•0.1 + 5•0.25 + 7•0.05 + 9•0.4
⇒ E[X] = 6.2
Answer:
5600
Step-by-step explanation:
Don’t know if the people surveyed were students or not
Answer: 905 cu. in.
Step-by-step explanation:
volume = (4/3) * π * r³
= (4/3) * π * 216
