Posted by Kevin on Friday, June 4, 2010 at 2:08pm.
1) What is the probability of tossing 6 coins and getting at least two tails?
2) Suppose you flip a penny, a nickel,a dime and a quarter. What is the probability of getting heads on the penny and nickel and dime and tails on the quarter?
Please show steps for the solutions.
Thank you.

Probability  Damon, Friday, June 4, 2010 at 8:52pm
p tails in 1 toss = .5
binomial distribution
p = .5
number of trials , n , = 6
number of successes = 2,3,4,5,6
number of failures = 0,1
so easier to work it backwards
what is the probability of 0 or 1 heads
p is still .5
p(0 heads) = C(6,0) (.5^0)(.5)^6 = .0156
p(1 heads) = C(6,1)(.5^1)(.5)^5 = 3*.03125 = .09375
sum = about .11
1  .11 = .89

Probability  Damon, Friday, June 4, 2010 at 8:55pm
Suppose you flip a penny, a nickel,a dime and a quarter. What is the probability of getting heads on the penny and nickel and dime and tails on the quarter?

independent experiments
1/2*1/2*1/2*1/2

Probability  Anonymous, Sunday, December 18, 2011 at 1:11am
a dime rolled 5 times find the probability of getting 4 exactly 5 times
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