A company that makes hair care products at 7000 people trying to shampoo of the 7000 people 28 had a mild allergic reaction what percent of the people had a mild allergic reaction

0.4%

Step-by-step explanation:

Given that:

Number of people with mild allergic reaction = 28

Total number of people = 7000

To find:

Percentage of people who have a mild allergic reaction to the shampoo = ?

Solution:

First of all, let us understand how can we calculate percentage of a particular amount.

Percentage of a particular amount can be calculated by dividing the amount with the total amount and then multiplying it with 100.

Percentage of from

Here,

Therefore, the percentage of people who have mild allergic reaction:

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )