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3 years ago

6

Joni earned twice the amount of money babysitting on Saturday as she did on Wednesday. She earned $15 more on Friday than Wednes

day. She earned $50 on Sunday. Her total earnings for all four days were $345. How much more did Joni earn on Wednesday than on Sunday?

1 answer:

Sloan [31]3 years ago

8 0

The answer is B.) $20.

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Answer:

The answer is 1/2

Step-by-step explanation:

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g A fair coin is tossed 20 times. The number of heads observed is the count X of successes. Give the distribution of X . Choose

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Answer:

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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:

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

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

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

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Since the quadratic factor (x² + 1) is irreducible any further, this is our answer.

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Answer:

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