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3 years ago

Bailey got a 75% on a quiz. They got 15 questions

Mathematics

1 answer:

Marina86 [1]3 years ago

8 0

Answer:

Step-by-step explanation:

1/4 of 20 is 75

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Software filters rely heavily on ""blacklists"" (lists of known ""phishing"" URLs) to detect fraudulent e-mails. But such filter

crimeas [40]

Answer:

a) $X \sim Binom(n=16, p=0.2)$

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:

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

The expected value is given by this formula:

$E(X) = np=16*0.2=3.2$

b) $P(X=0)=(16C0)(0.2)^{0} (1-0.2)^{16-0}=0.02815$

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".

Part a

Let X the random variable of interest, on this case we now that:

$X \sim Binom(n=16, p=0.2)$

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:

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

The expected value is given by this formula:

$E(X) = np=16*0.2=3.2$

Part b

For this case we want this probability:

$P(X=0)$

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 using this function we got:

$P(X=0)=(16C0)(0.2)^{0} (1-0.2)^{16-0}=0.02815$

6 0

3 years ago

The relationship between the number of pencils and the number of pens in Sophie’s pencil case can be represented using the ratio

tekilochka [14]

ratio of 6:10, if you divide both numbers by 2 you get a ratio of 3:5

multiply by 2 you get 12:20

multiply by 1.5 you get 9:15

D is not equivalent

4 0

3 years ago

Factor 7d+56<br> I'll give Brainless.....

Lesechka [4]

Answer: 7(d+56)=63d

Step-by-step explanation:

U add the 7 +56 and the answer is 63d plz mark brainly

7 0

3 years ago

And also this question as well

gtnhenbr [62]

Answer:

It's the second one I believe, because it's not a straight line, and nearly all functions have curved lines

Step-by-step explanation:

4 0

3 years ago

4 tomatoes cost $3.40 what is the unit rate

IRINA_888 [86]

The unit rat is the cost per 1 unit
cost per 1 tomatoe

3.4/4=1.7/2=0.85/1

unit rate is $0.85 per tomatoe

7 0

3 years ago