I got stuck on this one jeje

Mathematics

1 answer:

Lyrx [107]2 years ago

7 0

Answer:

D) 2852$

Step-by-step explanation:

basically you just multiply what the dude bought by how much money he spent, so

18 saws * 16$ = 1224 $

22 drills * 74$ = 1628$

then you add that together

1224 + 1628 = 2852$

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Step-by-step explanation:

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Answer:

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

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

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

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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:

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