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3 years ago

6

Mr. Kaplan is ordering 30 flash drives for the students in his class if each one cost $11.95 how much will it pay justify your a

nswer using the distributive property

1 answer:

kramer3 years ago

6 0

30 * 11.95 = 358.5 so mr kaplan will end up paying $358.5

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What Is,<br> 25% of $50,<br><br> 30% of $40,<br><br> 5% of $30,<br><br> 10% of $45,

marysya [2.9K]

Answer:

25% of 50 is 12.5

Step-by-step explanation:

30% of 40 is 12. 5% of 30 is 1.5. Lastly, 10% of 45 is 4.5

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3 years ago

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laiz [17]

Answer:

X=11

Step-by-step explanation:

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If 90 percent of automobiles in Orange County have both headlights working, what is the probability that in a sample of eight au

Marta_Voda [28]

Answer:

$P(X \geq 7) = P(X=7) +P(X=8)$

And we can find the individual probabilities using the probability mass function

$P(X=7)=(8C7)(0.9)^7 (1-0.9)^{8-7}=0.3826$

$P(X=8)=(8C8)(0.9)^8 (1-0.9)^{8-8}=0.4305$

And replacing we got:

$P(X \geq 7) = P(X=7) +P(X=8)=0.3826 +0.4305=0.8131$

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Solution to the problem

Let X the random variable of interest "number of automobiles with both headligths working", on this case we now that:

$X \sim Binom(n=8, p=0.9)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

And for this case we want to find this probability:

$P(X \geq 7) = P(X=7) +P(X=8)$

And we can find the individual probabilities using the probability mass function

$P(X=7)=(8C7)(0.9)^7 (1-0.9)^{8-7}=0.3826$

$P(X=8)=(8C8)(0.9)^8 (1-0.9)^{8-8}=0.4305$

And replacing we got:

$P(X \geq 7) = P(X=7) +P(X=8)=0.3826 +0.4305=0.8131$

7 0

3 years ago

Read 2 more answers

What should be subtracted from thrice the rational number -8/3 to get 5/2?

mezya [45]

Answer:

Sry don't know it lol. Stop answering my questions if you don't know it I want people that know the answer

7 0

3 years ago

Listen Two construction cranes are used to lift identical 1200-kilogram loads of bricks the same vertical distance. The first cr

AveGali [126]

Answer:

The power developed by the 1st crane is twice the power developed by the 2nd crane.

Step-by-step explanation:

According to the question,

work done by both of the cranes are the same. Let it be W.

Then power developed by the first crane,

= $P_{1} = \frac {W}{20}$ unit -----------------(1)

and, the power developed by the 2nd crane,

= $P_{2} = \frac {W}{40}$ unit ------------------(2)

So, we get that,

$P_{2} = \frac {P_{1}}{2}$

So, the power developed by the 1st crane is twice the power developed by the 2nd crane.

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3 years ago