Stats :
A bag contains 25 balls marked 1 to 25.One ball is drawn at random. What is the probability that it is marked with a number which is multiple of 5 or 6.

Question

terenzreignz · Answer

Key to probability: Number of 'good' outcomes divided by total number of outcomes.
Total number is 25, yes?

uri · Answer

Yeah? :p

terenzreignz · Answer

Now... you have to count... how many numbers from 1 to 25 are multiples of 5 OR multiples of 6?

terenzreignz · Answer

yeah.... just did... why?

terenzreignz · Answer

Yes, I did. And I replied.

uri · Answer

Okay get it,Multiples of 5 are 5 -10-15-20-15 and mutiples of 6 are 6,12,18,24

terenzreignz · Answer

That's good... now COUNT them :3

uri · Answer

Count what? :) Like how many are in 5 there are 5? :P

terenzreignz · Answer

How many multiples of 5 or 6 are in the set 1-25?

uri · Answer

5 and 5.

terenzreignz · Answer

5? You may want to count the multiples of 6 again.

(Woe to you and your Mathematics career if you forget how to count... O_O)

uri · Answer

LOOOOOOOOOL 4.

terenzreignz · Answer

okay, so 5 and 4 make...?

uri · Answer

wait 9.

terenzreignz · Answer

**20** <snigger>
anyway, so that's the number of 'good' outcomes (in that the number drawn is a multiple of 5 OR a multiple of 6)

Divide that by the total (25) and that's your answer :P

uri · Answer

9/25 =0.36

terenzreignz · Answer

Whichever. I prefer fractions :)

uri · Answer

Good...:) Thankyou! $\Huge \color{magenta}{ \ddot \smile } $

jack1 · Answer

that smileyface... its sideways...?