Question

A bag contains 7 red and 8 black balls. find the probability of drawing a red ball. ​

Answer 1

Answer:

No. of red balls = 7

No. of black balls = 8

Total balls = 15

SO probability of drawing a red ball is = 7/15

Answer 2

The probability of drawing a red ball = 7/15

Given :

A bag contains 7 red and 8 black balls

To find :

The probability of drawing a red ball

Solution :

Step 1 of 3 :

Find total number of possible outcomes

Here it is given the bag contains 7 red and 8 black balls

∴ Total number of balls in the bag

= 7 + 8

= 15

So the total number of possible outcomes = 15

Step 2 of 3 :

Find the total number of possible outcomes for the event

Let A be the event that of drawing a red ball

Total number of red balls in the bag = 7

So the total number of event points for the event A is 7

Step 3 of 3 :

Find the probability

The probability of drawing a red ball

$\sf{ =P(A) }$

$\displaystyle \sf{ = \frac{Number \: of \: favourable \: cases \: to \: the \: event \: A }{Total \: number \: of \: possible \: outcomes }}$

$\displaystyle \sf{ = \frac{7}{15} }$

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