Question

.

Answer 1

There are 12 numbers total: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

Answer 2

Of this list of numbers, which are perfect squares?

Answer 3

Ummm... 1, 4, 9?

Answer 4

good

Answer 5

so there are 3 perfect squares out of 12 total

the probability is 3/12 = 1/4

Answer 6

ie you have a 1 in 4 chance (25% chance) of rolling a perfect square

Answer 7

Okay! :) So.. Im confused about the nearest tenth part then. Or is that 25?

Answer 8

what you do for the next part is add up the numbers from 1 to 12

then you divide by 12

Answer 9

Thats all?

Answer 10

yep

Answer 11

Okay, thank you so much! :) So.. this is grade 12 math... are there any special formula's I should be using? Or is it simply that? 1/4?

Answer 12

you're just using the idea that

P(event A happening) = (# of ways for event A to happen)/(# of ways total)

Answer 13

OH So P(a) = 1/4?

Answer 14

and expected value is

E[X] = sum of x*p

where

x = value
p = probability of that value x of occuring

Answer 15

Ohhhh. Okay! I see now. Thanks!!

Answer 16

I would stick to 1/4 and don't worry about the P(a) part

Answer 17

Okay, Thanks! :)

Answer 18

yw