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anastassius [24]
3 years ago
14

Barbara buys a box of pens for $4. For every additional box she buys, she gets a $1 discount.

Mathematics
2 answers:
k0ka [10]3 years ago
8 0
Need more information
Zepler [3.9K]3 years ago
5 0
The answer is 3 dollers
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Simplify 20 + 5^2 × 2
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Answer:

Step-by-step explanation:

Bonjour,

20+ 5*5 *2=

20 +25*2 =

20+50 = 70

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Please please please help me
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z=20 and y=38

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Kent has paid a total of $589 For internet service. Each month of service cost $19. How many months, m, of internet service has
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A boiler has five identical relief valves. The probability that any particular valve will open on demand is 0.93. Assume indepen
noname [10]

Answer:

There is a 99.99998% probability that at least one valve opens.

Step-by-step explanation:

For each valve there are only two possible outcomes. Either it opens on demand, or it does not. This means that we use the binomial probability distribution to solve this problem.

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 combinatios of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

In this problem we have that:

n = 5, p = 0.93

Calculate P(at least one valve opens).

This is P(X \geq 1)

Either no valves open, or at least one does. The sum of the probabilities of these events is decimal 1. So:

P(X = 0) + P(X \geq 1) = 1

P(X \geq 1) = 1 - P(X = 0)

So

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

P(X = 0) = C_{5,0}.(0.93)^{0}.(0.07)^{5} = 0.0000016807

Finally

P(X \geq 1) = 1 - P(X = 0) = 1 - 0.0000016807 = 0.9999983193

There is a 99.99998% probability that at least one valve opens.

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Linear equation:

y=mx+b
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