Question

1. two coins are tossed, find the probability that two heads are obtained. note: each coin has two possible outcomes H (heads) and T (tails).

2. which of these numbers cannot be a probability? why?

a) -0.00001

b) 0.5

c) 20%

d)0

e) 1

3. in a deck of 52 cards, what is the probability of drawing a three of spades, and then a four of clubs, without replacement?

4. what is the probability of the same outcome in #3, but with replacement?

5. the area under the normal distribution curve that lies within two standard deviations of the mean is approximately ___ %.

Answer 1