Of the 10 people attending a seminar, 5 have gray hair. What is the probability that a randomly selected person will have gray hair?

1/2

Step-by-step explanation:

So we know that there is a total of 10 people.

5 of these have grey hair.

To find the chances of a somone having grey hair, we need to divide people with grey hair over total people:

This is the same division we use to find things such as percentage and ratio as well.

Now lets plug in our numbers and solve:

So half of the people have grey hair.

Or(in percentage):

The probability is 50% that someone will have grey hair.

Hope this hepls!

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons