Question 160822
5.2 (10, 14)

10. No, p(x)<=1, p(20)>1.
.
.
.

14. Discrete, the values are only positive integers (0,1,2,3,...). no numbers in between.
.
.
.

5.3 Problem # 19

{{{E=80000(0.2)+40000(0.7)+(-50000)(0.1)}}}
{{{E=16000+28000-5000=39000}}}
  
You put in $50,000 and get back $39,000. Doesn't seem like a good investment.

 .
.
.
Coin flipping is a binomial event (heads or tails).
Number of trials(coin flips), n=20
Probability of heads, p=1/2.
Mean={{{np}}}=10 heads
Variance = {{{np(1-p)=20(1/2)(1-1/2)=5}}}
Standard deviation = {{{sqrt(np(1-p))=sqrt(5)}}}