# probability

what is the probability of getting a head when tossing 4 coins simultaneously

1. 👍
2. 👎
3. 👁

Pr= .5^4

1. 👍
2. 👎
👤
bobpursley
2. I read that as a binomial distribution.
so
C(4,1) (1/2)^1 (1/2)^3
= 4(1/2)^4
= 1/4

or

there are 2^4 or 16 cases
HTTT
THTT
TTHT
TTTH, or 4 possibilities
prob(exactly one head) = 4/16 = 1/4

1. 👍
2. 👎
3. I agree on 1/4, the answer I posted is of getting a HTTT, but there are four ways of getting a H (first, second, third, ..), or Pr=4/16 or 1/4

Thanks for checking Reiny.

1. 👍
2. 👎
👤
bobpursley

## Similar Questions

1. ### Math

A fair coin is tossed two times in succession. The set of equally likely outcomes is {HH, HT, TH, TT}. Find the probability of getting exactly one head. The probability of getting one head

2. ### math

Two coins were tossed 10 times. The results are shown below. toss: 1 | 2| 3 | 4 | 5 | 6 | 7 | 8 | 9 | |10 results: hh | tt | ht | th | ht | hh | th | tt |TH | HT What is the experimental probability that at least one of the coins

3. ### math

Below are the results of tossing a number cube 9 times. Find the experimental probability of tossing an odd number. 4,3,6,6,2,5,3,5,1. a. 4/9 b. 1/2 c. 5/9 d. 2/3 ** am i correct?

4. ### math

below are the results of tossing a number cube 8 times find the experimental probability of tossing an even number. 3,4,1,2,5,1,6,5 1. 1/4 2. 3/8 3. 1/2 4. 5/8

1. ### math

Write the number of permutations in factorial form. Then simplify. How many different ways can you and four of your friends sit in the backseat of a limousine? a) 4!; 24 b) 4!; 120 c) 5!; 120 *** d) 5!; 720 Below are the results

2. ### Math

The table below shows the results of flipping two coins. how does the experimental probability of getting at least one tails compare to the theoretical probability of getting at least one tails Outcome: HH HT TH TT # of times

3. ### Math

Two coins were tossed 10 times. The result is shown in the table below. Toss: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Result: 1)HH, 2)TT, 3)HT, 4)TH, 5)HT, 6)HH, 7) TH, 8)TT, 9) TH, 10) HT What is the experimental probability that at least

4. ### MATH

Need help on the question below. A cat has a litter of 5 kittens. Which simulation could be used to determine the probability that exactly 3 kittens will be female? a. tossing 5 coins b. spinning a spinner with 5 equal parts c.

1. ### math

Clayton has three fair coins. Find the probablitlity that he gets two tails and one head when he flips the three coins.

2. ### Independent and dependent events

A six-sided-cube is labeled with the numbers 1, 2, 2, 3, 3, and 3. Four sides are colored red, one side is white, and one side is yellow. Find each probability. Tossing 2, then 2. Tossing red, then white, then yellow.

3. ### Math

Four coins fall onto the floor. Find the probability that (a) exactly three coins land heads up (b) all coins land tails up (c) two or more coins land heads up (d) no more than two coins land tails up (e) at least one coin lands

4. ### MATH

6. Compute the probability of tossing a six-sided die and getting a 7