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TSI Math: Adding Probabilities 47 Views


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Description:

A bag contains 12 grape candies, 7 apple candies, 10 strawberry candies, and 11 lemon candies. Nikki takes one candy from the bag, and then a second. What is the probability that she withdraws both an apple and a lemon candy, in either order?


Transcript

00:01

Okay sy mash bumpers Next up a bag contains twelve

00:05

grape candy seven applicant he's ten strawberry candies and eleven

00:09

lemon candies Nicky takes one candy from the bag and

00:12

then a second what's the probability that she withdraws both

00:16

an apple and a lemon candy in either order No

00:24

okay nikki could either taken apple candy first and a

00:27

lemon candy second or a lemon candy first an apple

00:30

candy second right Either way probability and fruit candy make

00:33

a very fun paring right before nikki reaches into the

00:37

bag There are a total of twelve plus seven plus

00:38

ten plus eleven forty candies in the bag The probability

00:42

of taking an apple candy first is seven out of

00:45

forty because well seven out of the forty candies in

00:47

the bag or apple flavored Now there are only thirty

00:50

nine candies left in the bag so the probability gets

00:53

all wonky here Probability of taking one of the eleven

00:57

candies next is eleven out of thirty nine Well multiply

01:00

the individual probabilities together to find the total probability of

01:02

taking an apple candy first and a lemon candy seconds

01:05

We've got to calculate this whole thing first that seven

01:08

times eleven at seventy seven over whatever forty times thirty

01:11

nine years and the total there is point Oh for

01:14

nine force about five percent Okay great job so far

01:17

Using the same reasoning is before we find the probability

01:20

of taking a lemon candy first which is eleven Out

01:22

of forty all right we've removed one candy from the

01:24

bags of the probability of taking an apple candy Second

01:27

is seven out of thirty nine Well now he multiplied

01:29

those two probabilities together to find the total probability of

01:32

taking a lemon candy and then an apple candy and

01:34

we get eleven over forty times seven over thirty nine

01:37

And guess what It's still point Oh four nine four

01:40

Note that apple then lemon and lemon than apple have

01:44

the same probability Will the total probability of either one

01:47

of these two sequences of events occurring is the sum

01:51

of their probabilities We're goingto adam up so it's about

01:53

nine point eight percent They're rounded to match the answer

01:56

choices while the probability of taking both an apple and

01:59

a lemon candy then and either order is point Oh

02:02

nine nine yeah mingo nif isn't so that's it The 00:02:06.102 --> [endTime] answer is b and we're shmoop this

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