Question

A card is chosen from a deck of cards, recorded, and then replaced. this is done 75 times and red card from 5 to 9 is chosen 21 times. a) what is the theoretical probability of a red card between 5 and 9 being chosen? b) how many times would you expect this event to happen in 75 trials? c) compare your answers to part a) and b)

Answer 1

so this is similar to the last one. you want to know how many possibilities there are that a given event happens (in this case red 5-9), and how many possibilities there are total.
The first things you need to determine are:
1. how many red cards are there between 5 and 9?
2. how many total cards are in the deck?

Answer 2

well how many red cards are there in a deck .. is it 26
>?

Answer 3

right, so there are 5,6,7,8,9 of diamonds and hearts

Answer 4

so 10 total that are red AND 5-9

Answer 5

there are 52 cards in the deck total

Answer 6

so the probability of a red card that is 5-9 = 10 (the number of red 5-9)/52 (total number of cards)

Answer 7

yay I get it!

Answer 8

how did you get 10?

Answer 9

well, in a deck of cards, the red cards are diamonds and hearts

Answer 10

so there are two sets of 5-9 that are red - hearts and diamonds

Answer 11

iok

Answer 12

so in total, there are 5,6,7,8,9 of hearts, and 5,6,7,8,9 of diamonds, so 10 total

Answer 13

true

Answer 14

so the probability = (possible red 5-9) divided by ( total possible cards)

Answer 15

man i hate card problems.. how the heck would i know how many cards are there...I mean gambling is illegal in schols..

Answer 16

*schools

Answer 17

lol

Answer 18

true - so (a) = 10/52

Answer 19

so how do you think you get b?

Answer 20

how do i rememeber all those red cards and everything?? coz itss hard :"S

Answer 21

well, the good news is that a deck of cards is used across a LOT of probability questions

Answer 22

is it lik 10/52 * 75 ?

Answer 23

so you just gotta know - there are 52 cards, 4 suits, 2 suits of each color, 13 cards in each suit

Answer 24

and yes, you are correct

Answer 25

YAY!

Answer 26

so good work =)

Answer 27

whoz rigjht me???

Answer 28

yup!

Answer 29

boom!

Answer 30

thats amazing :O

Answer 31

it happens :p and it will happen more the more you practice

Answer 32

and i still dont get it.. maybe im not tryin hard enough =/

Answer 33

embarassin really, bein good in calc and when someone asks me a stat question i gtg.. sorry i dunno..

Answer 34

haha, well if you asked me a calc question I'd give you a blank stare :p

Answer 35

i got aniother questin too

Answer 36

k, I'd say ask a different one on the left side

Answer 37

and I'm sure many of us will make the jump

Answer 38

ok make sure that uhelp me
lol

Answer 39

ur supposed to be asking another question

Answer 40

shes tryin to do it on her own