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Delicious77 [7]

3 years ago

7

A student saves $15 per week toward the purchase of a guitar. Her grandmother gives her $50 to help her reach her goal. Which fu

nction can be used to find the amount in dollars the student has saved after x weeks?

2 answers:

Sauron [17]3 years ago

3 0

y=15x+50 it should look something like that

soldier1979 [14.2K]3 years ago

3 0

Yeah I agree with the person that answered

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At a carnival, contestants are asked to keep rolling a pair of dice until they roll snake eyes. The number of rolls needed has a

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Answer:

The two numbers of rolls are 25.2 and 46.8.

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The Chebyshev's theorem states that, if X is a r.v. with mean µ and standard deviation σ, then for any positive number k, we have

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Here

$(1-\frac{1}{k^{2}})=0.75\\\\\Rightarrow \frac{1}{k^{2}}=0.25\\\\\Rightarrow k=\sqrt{\frac{1}{0.25}}\\\\\Rightarrow k=2$

Then we know that,

$|X - \mu| \geq k\sigma,\\\\ \Rightarrow \mu - k\sigma \leq X \leq \mu + k\sigma$ .

Here it is given that mean (µ) = 36 and standard deviation (σ) = 5.4.

Compute the two values between which at least 75% of the contestants lie as follows:

$P(\mu - k\sigma \leq X \leq \mu + k\sigma)=0.75\\\\P(36 - 2\cdot\ 5.4 \leq X \leq 36 + 2\cdot\ 5.4)=0.75\\\\P(25.2\leq X\leq 46.8)=0.75$

Thus, the two numbers of rolls are 25.2 and 46.8.

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