statistics
posted by nneamaka .
air coin is flipped 20 times.
a. Determine the probability that the coin
comes up tails exactly 15 times.
b. Find the probability that the coin comes
up tails at least 15 times.
c. Find the mean and standard deviation for
the random variable X giving the number
of tails in this coin flipping problem.

15
Respond to this Question
Similar Questions

Math
Would you be more likely to get at least 70% tails if you flip a fair coin 10 times or if you flip a fair coin 1000 times? 
Probability
Suppose that an unfair coin comes up heads 54.1% of the time. The coin is flipped a total of 13 times. a) What is the probability that you get exactly 6 heads? 
probability
Suppose an unfair coin comes up heads 52.2% of the time if it is flipped. If the coin is flipped 26 times, what is the probability that: a) it comes up tails exactly 12 times? 
Statistics
Suppose Tori has an unfair coin which lands on Tails with probability 0.28 when flipped. If she flips the coin 10 times, find each of the following: Question 5 options: P(No more than 3 Tails) P(Exactly 1 Tail) P(At least 5 Tails) … 
math
Carolyn tested a coin to see if it was evenly weighted. She flipped the coin 100 times and came up with 42 heads and 58 tails. How does the relative frequency of tails to heads compare to the probability of tails in this experiment? 
Math.
You repeatedly toss a fair coin for 5 times. What is the probability that heads comes up at least 3 times before tails comes up twice? 
Math
we have 2 coins: coin 1 comes up with the probability of tails of 2/3 while coin 2 comes up with the probability of tails of 1/3 you don't know which is which so you pick one up at random and flip it . If its tails, you guess that … 
probability
Grace has flipped a coin 500 times and each time is has come up tails. If she flips the coin 500 more times, how many tails should she expect? 
Math
A fair coin is flipped four times. What is the probability that tails occurs exactly 3 times if it is known that tails occurs at least twice? 
Math
You flip a coin 20 times and get tails 15 times you flip the coin 80 more times.what do you expect to happen to the experimental probability of getting tails as you increase the number of trials a. The experimental probability will …