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kotegsom [21]
3 years ago
7

It takes 20 minutes for 5 people to paint 5 walls how many minutes does it take 9 people to paint 9 walls

Mathematics
2 answers:
nirvana33 [79]3 years ago
8 0

Answer: 20 minutes

Step-by-step explanation:

Imagine that each person is assigned one wall, and all 5 people begin painting at the same time.

Since everyone will finish painting their assigned wall after 20 minutes, it takes one person 20 minutes to paint one wall.

If we have 9 people and 9 walls, we can again assign one wall to each person.

Everyone will take 20 minutes to paint their assigned wall.

In other words, it takes 20 minutes for 9 people to paint 9 walls.

Ivenika [448]3 years ago
3 0

5×4 is 20. So I figure 9×4 is 36. 36 minutea

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Answer:

0.7208 = 72.08% probability that this whole shipment will be accepted.

Step-by-step explanation:

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Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

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And p is the probability of X happening.

4% rate of defects

This means that p = 0.04

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What is the probability that this whole shipment will be accepted?

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Thus

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P(X \leq 1) = P(X = 0) + P(X = 1) = 0.3460 + 0.3748 = 0.7208

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