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bulgar [2K]
3 years ago
10

David and his TWO brothers deliver papers every morning.Each one of them can deliver a paper every two minutes,and between the t

hree of them they deliver 147 paper.How many long does is take to deliver the paper.
Mathematics
2 answers:
melamori03 [73]3 years ago
5 0
To deliver 147 papers among the three of them, which each of them delivers a paper every 2 minutes. so every 2 minutes 3 papers are delivered ok so you will need to divide 147 by the number of papers deliver in 2 minutes so that would give us the equation 147/3 and times it by the number of minutes it takes for each person to deliver 1 paper which is 2 so 147/3=49*2=98 so it takes 98 minutes for all three of them to deliver 147 papers
Gre4nikov [31]3 years ago
3 0
73.5 

I believe you need to divide

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If the survey subjects volunteered to​ respond, then this a voluntary sampling and the estimated probability p may be biased, as only the people interested in the topic participate.

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P(x=k)=\dbinom{n}{k}p^k(1-p)^{n-k}=\dbinom{4}{k}\cdot0.6^k\cdot0.4^{4-k}

We have to calculate the probability that 1 or more are more careful about personal information when using a public​ Wi-Fi hotspot. This can be calculated as:

P(x\geq1)=1-P(x=0)\\\\\\P(x=0)=\dbinom{4}{0}\cdot0.6^{0}\cdot0.4^{4}=1\cdot1\cdot0.0256=0.0256\\\\\\P(x\geq1)=1-0.0256=0.9744

The probability that 1 or more individuals in the sample are more careful about personal information when using a public​ Wi-Fi hotspot is 0.9744.

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