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TSI Math: How Many Times Will Jaqen Roll Two 10s?

Jaqen has two 10-sided dice. He rolls both at the same time. What is the probability that both faces add up to a number less than 20?

Data Analysis, Statistics, and Probability	Probabilistic Reasoning
Mathematics and Statistics Assessment	Probabilistic Reasoning
Product Type	TSI
TSI	Mathematics and Statistics Assessment TSI Math TSI Mathematics
TSI Math	Data Analysis, Statistics, and Probability
TSI Mathematics	Data Analysis, Statistics, and Probability
Test Prep	TSI

Transcript

00:24

combination of faces adds up to a number less than

00:27

twenty much faster to find the probability of rolling two

00:29

tens and find the probability of all the other possible

00:32

roles so just take the shortcut there Well the probability

00:34

of rolling ten on one dies one in ten because

00:37

each of the ten faces has an equal probability of

00:40

turning up The probability of rolling to tens then is

00:43

one over ten times one over ten or one over

00:47

one hundred or one percent The probability of rolling anything

00:50

other than two tens and a rowing to faces that

00:53

add up to a number less than twenty is one

00:55

minus the probability of that one hundred shot So it's

00:59

ninety nine out of one hundred probability that both faces

01:02

add up to a number less than twenty is ninety

01:05

nine out of one hundred And yeah we like those

01:07

odds So the answer is c and we're so shmoop