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3 years ago

Nikki had 70% of her savings left in her bank account. If she has $230 in her bank account, how much did she start with?

Mathematics

1 answer:

Alex3 years ago

6 0

Answer:

$299

Step-by-step explanation:

Given that 70% is $230 you can divide this by 7 to get 10%.

10% is 23. The remaining percentage we need is 30.

Soo 10% x 3 = 30%. (23x3)

23 x 3 = 69.

69 + 230 = $299

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In tossing four fair dice, what is the probability of tossing, at most, one 3

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Answer-

In tossing four fair dice, the probability of getting at most one 3 is 0.86.

Solution-

The probability of getting at most one 3 is, either getting zero 3 or only one 3.

$P(A) =The \ probability \ of \ getting \ zero \ 3 =(\frac{5}{6})(\frac{5}{6})(\frac{5}{6})(\frac{5}{6})=\frac{625}{1296} =0.48$ ( ∵ xxxx )

$P(B) = The \ probability \ of \ getting \ only \ one \ 3 =(4)(\frac{1}{6})(\frac{5}{6})(\frac{5}{6})(\frac{5}{6}) = 0.38$ ( ∵ 3xxx, x3xx, xx3x, xxx3 )

P(Atmost one 3) = P(A) + P(B) = 0.48 + 0.38 = 0.86

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Answer:

Step-by-step explanation:

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