Question 1152674: Suppose that you flip a coin 15 times. What is the probability that you achieve at least 4 tails? Answer by Edwin McCravy(19273) You can put
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Use your TI-83 or TI-84, the binomcdf( feature under 2ND VARS The binomcdf( feature only calculates "at most", so if you want the probability of "at least" you must convert it to "at most", by subtracting from the number of trials, and subtract the probability p of a success on one trial from 1. At least 4 tails is the same as at most 11 heads. So the number of trials is 15, the probability p of a head on one trial is 0.5, and the x value is 11, so you want binomcdf(15,0.5,11) press ENTER and get 0.982421875 Edwin
Question 1125822: Suppose that you flip a coin 12 times. What is the probability that you achieve at least 4 tails? Answer by greenestamps(11389) You can put this solution on YOUR website! # of ways of getting 0 tails: C(12,0) = 1 # of ways of getting less than 4 tails: 1+2+66+220 = 299 # of ways of getting at least 4 tails: 2^12 - 299 = 4096-299 = 3797 Probability of getting at least 4 tails: 3797/4096 = 92.7% Want to join the conversation?
What is the probability of at least 5 heads when flipping a coin 7 times?The number of trials is represented by the letter 'n' and for this question n = 7. Hence, the probability of flipping a coin 7 times and getting heads 5 times is 21/128.
What is the probability of flipping a coin 7 times?With seven flips, we have 128 possibilities, with only one of these possibilities being a successful one (T-T-T-T-T-T-T). Thus, the probability of flipping seven tails in a row in seven flips is 1 in 128.
When flipping a coin 7 times what is the probability that at least 4 heads appear?Hence, the probability of flipping a coin 7 times and getting heads 4 times is 35/128.
Which the probability of getting at least 2 tails when you flip a coin 7 times?If you flip a fair coin 7 times, the probability that you will get exactly 2 tails is 21/128.
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