Question

betsy goes running 2 days out of 7 and james goes running 5 days out of 7. What is the probability that one of them is running on any given day.

Answer 1

not a good question
Betsy could be running the 2 days that James is not running, so one of them would be running every day
in that case the prob = 1

On the other hand , there would have to be days when they are both running or days when only 1 is running, or days when neither is running
The question cannot be answered with the information given.

Answer 2

Multiply the two probabilities together.

2 5 10
- x - = --
7 7 49

There is a 10/49 chance that AT LEAST one of them is running on a given day. I think.

Answer 3

Disregard my previous answer. You should add the probabilities. 7/7 chance.

Answer 4

There is a 10/49 chance that BOTH of them are running.

Answer 5

I am sorry i am confused? Is it 10/49 or is the answer 7/7?

Answer 6

rgrggr