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sertanlavr [38]

3 years ago

5

Maria spends $20 on lottery tickets every week and spends $125 per month on food. On an annual basis the money spent on the lott

ery tickets is _% of the money spent to buy food.

2 answers:

nika2105 [10]3 years ago

7 0

16% - 20$ divides by 125$ is .16, then multiply by 100 to get it from % to decimal.

melomori [17]3 years ago

3 0

Divide $20 by $125 because you are trying to find the % of the tickets to the food.

Answer - %16

I think :)

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tatyana61 [14]

Answer:

The probability that at least 13 flights arrive late is 2.5196 $\times 10^{-6}$ .

Step-by-step explanation:

We are given that Southwest Air had the best rate with 80 % of its flights arriving on time.

A test is conducted by randomly selecting 18 Southwest flights and observing whether they arrive on time.

The above situation can be represented through binomial distribution;

$P(X = x) = \binom{n}{r}\times p^{r} \times (1-p)^{n-r} ; x = 0,1,2,3,.........$

where, n = number of trials (samples) taken = 18 Southwest flights

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Let X = <u><em>Number of flights that arrive late</em></u>.

So, X ~ Binom(n = 18, p = 0.20)

Now, the probability that at least 13 flights arrive late is given by = P(X $\geq$ 13)

P(X $\geq$ 13) = P(X = 13) + P(X = 14) + P(X = 15) + P(X = 16) + P(X = 17) + P(X = 18)

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= 2.5196 $\times 10^{-6}$ .

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