Question

You have an equally likely chance of choosing an integer from 1 through 40. Find the probability of the given event.

1. An odd number is chosen

2. A prime number is chosen

Answer 1

@ganeshie8

Answer 2

Of all integers from 1 to 40, how many are odd?

Answer 3

@Ammarah Are you there?

Answer 4

yes

Answer 5

Would you like to answer my question above?

Answer 6

39?

Answer 7

What?

Answer 8

What is an even number?
An odd number is a number that is not even.

Answer 9

1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Which numbers above are odd?

Answer 10

i know theres 20

Answer 11

Ok, that's better.
There are 20 odd integers out of a total of 40 integers.

Answer 12

\( P(event) = \dfrac{number~of~desired~outcomes}{total ~number~of~outcomes} \)

Answer 13

20/40

Answer 14

The event you want is to pick an odd number.
There are 20 desired outcomes.
There are 40 numbers that can be picked, so the total number of outcomes is 40.
Now you can use the formula above to find the probability of picking an odd integer.

Answer 15

Correct. Now you need to reduce the fraction.

Answer 16

1/20

Answer 17

is that it?

Answer 18

20/40 \(\ne\) 1/20

Answer 19

yeah but is that the final?

Answer 20

for prime i got 13/40 is that correct @ganeshie8

Answer 21

1/20 is not the final -.-

Answer 22

btw, for primes u should get 12/40

"1" is not a prime :
http://www.wolframalpha.com/input/?i=primes+below+40