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Roman55 [17]
3 years ago
13

Heather opens a bank account with $125. Each week, starting the following week, she deposits $25 into her account.

Mathematics
2 answers:
yawa3891 [41]3 years ago
5 0
25n+100. this is the verified answer. I just took the test. 
vichka [17]3 years ago
3 0
The equation is y=25n+125 I think
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Suppose a bag contains many marbles, 54% of which are purple. You draw 5 marbles from the bag with replacement.
dolphi86 [110]

Part A

Use the binomial probability distribution formula.

p = 0.54 = probability of getting a purple marble

n = 5 = sample size

x = 2 = number of purple we want to get

P(x) = \frac{n!}{x!(n-x)!}*p^x*(1-p)^{n-x}\\\\P(2) = \frac{5!}{2!(5-2)!}*0.54^2*(1-0.54)^{5-2}\\\\P(2) = 10*0.54^2*0.46^3\\\\P(2) = 0.283831776\\\\

The \frac{n!}{x!(n-x)!} portion is from the nCr combination formula. The exclamation marks indicate a factorial.

Alternatively, you could use Pascal's Triangle for that portion.

<h3>Answer: 0.283831776</h3>

This decimal value is exact. Round it however you need to.

============================================================

Part B

To find the expected value, aka the mean, we multiply the sample size and probability of getting a purple marble on any single selection.

n*p = 5*0.54 = 2.7

<h3>Answer: 2.7</h3>
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2 years ago
Solve the following system: (5 points)
posledela
I wish I could help but I didn’t learn that
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Answer:

Step-by-step explanation:

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