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RoseWind [281]
3 years ago
12

Say you flip a coin seven times. What is the probability the number of heads will be even?

Mathematics
1 answer:
Oksanka [162]3 years ago
5 0

Answer:

The probability the number of heads will be even is 0.4922.

Step-by-step explanation:

Consider the provided information.

It is given that coin flip seven times.

Thus, the total number of possible outcomes are: 2^7

We want heads will be even.

Even numbers are 2, 4, 6.....

Thus, the possible case are: 2 heads, 4 heads or 6 heads.

The required probability is:

(^7C_2+^7C_4+^7C_6)\times\frac{1}{2^7}=\left(\frac{7!}{2!5!}+\frac{7!}{4!3!}+\frac{7!}{6!1!}\right)\frac{1}{128}\approx 0.4922

Hence, the probability the number of heads will be even is 0.4922.

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A group of 100 people is divided into 2 teams with 45 people in team A and 55 people in team B.
Zepler [3.9K]
Team A) 45 people
Team B) 55 people

A)There are two ways to solve this problem, finding the number of combinations possible for Team B, or the number of combinations possible for Team A. 
Team A
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Sales variances may be computed in a manner similar to cost variances–that is, computing both price and volume variances.
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