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3 years ago

6

Keith has $500 in a savings account to beginning of the summer he wants to have at least $200 at the end of the summer he withdr

aws 25 per week for the tickets how many weeks can Keith withdraw money from his account

2 answers:

jonny [76]3 years ago

8 0

12 weeks you just have to divide 300 and 25

IgorLugansk [536]3 years ago

5 0

The Answer is: 12 weeks
You just take 300/25 and you get the weeks

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3 years ago

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Nuetrik [128]

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Where (nCx) means combinatory and it's given by this formula:

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Step-by-step explanation:

Previous concepts

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The probability mass function for the Binomial distribution is given as:

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Where (nCx) means combinatory and it's given by this formula:

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Solution to the problem

We assume that we have a fair coin that is $p(Head)=p(Tails)=0.5$

For this case we define the random variable X as "number of heads observed in 20 times". The distribution for X is given by:

$X \sim Binom(n=20, p=0.5)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

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Ilya [14]

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2 years ago

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