Answer:
0.55% probability that exactly 5 out of the first 13 customers buy a magazine
Step-by-step explanation:
For each customer, there are only two possible outcomes. Either they buy a magazine, or they do not. The probability of a customer buying a magazine is independent of other customers. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

In which
is the number of different combinations of x objects from a set of n elements, given by the following formula.

And p is the probability of X happening.
10% of his customers buy a magazine
This means that 
What is the probability that exactly 5 out of the first 13 customers buy a magazine?
This is P(X = 5) when n = 13. So


0.55% probability that exactly 5 out of the first 13 customers buy a magazine
Answer:
3/2 or 1.5
Step-by-step explanation:
Answer:
There are 0.0328 centimeters in 1 foot.
Step-by-step explanation:
Given : There are 12 inches in 1 foot.
To find : How many centimeters are there in 1 foot?
Solution :
1 foot = 12 inches
and 1 inch = 2.54 centimeter
So, 12 inches =
centimeter
12 inches = 30.48 centimeter
i.e. 1 foot = 30.48 centimeter
Then, 1 centimeter =
foot
1 centimeter = 0.0328 foot
Therefore, there are 0.0328 centimeters in 1 foot.
8k = 4/9
Divide 8 to both sides, or multiply by its reciprocal 1/8:
k = 4/9 * 1/8
k = 4/72
k = 1/18