Question

Wesley draws a card at random from a well-shuffled deck of playing cards.The probability that Wesley draws a number card or a black card is.

Answer 1

ik nothing of cards

Answer 2

there are 40 number cards out of a pack of 52 cards.
The number of black cards is 26.

Answer 3

would i add the two together to get the out of numbered or black cards?

Answer 4

you have to add probabilities but some black cards are also numbered . I'll have to check this.

Answer 5

okay

Answer 6

Yes we need to use the following rule

required probability = P(Black) + P(number) - p ( black intersect number)

the last part means the probability of them both occurring

I couldn't find the symbol for intersect on equation editor. It looks like an inverted U.

Answer 7

P(Number) = 40/52 = 10/13
P(Black) = 26/52 = 1/2

Answer 8

What is the Probability of getting a card which is both numbered and black?

Answer 9

i got 33/26 0r 1 7/26

Answer 10

How many are numbered and black?

Answer 11

how did you get that?

Answer 12

P(black) + P(number) = 33/26 but you have to subtract the 'intersect' propbability

Answer 13

there are 20 cards which are black and numbers so what is the probability of picking one of theses?

Answer 14

20/52 agreed?

Answer 15

or 10/26

so we have 20/26 + 13/26 - 10/26

Answer 16

follow?

Answer 17

I cant believe the equation editor hasnt got a symbol for intersecting of sets.

Answer 18

unless I've missed it...

Answer 19

i didnt know to do all that. so it was wrong?