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Over [174]
3 years ago
13

The bank offers two kinds of checking accounts. Account A charges a fee of $.20 for each check that is written and has no monthl

y service charge. Account B charges $.10 for each check and has a monthly service charge of $1.50. How much would you save if you chose Account B and wrote 250 checks in a year?
Mathematics
1 answer:
Leya [2.2K]3 years ago
8 0
Account A.....with 250 checks
0.20(250) = 50

Account B...with 250 checks
0.10(250) + 1.50 = 25 + 1.50 = 26.50

so by using Account B, u r saving (50 - 26.50) = 23.50
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Answer:

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Step-by-step explanation:

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For a binomial process, the probability of success is 40 percent and the number of trials is 5. Find the standard deviation.
Yakvenalex [24]

Answer:

Sd(X) =\sqrt{1.2}=1.095

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, on this case we now that:

X \sim Binom(n=5, p=0.4)

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 mean for the binomial distribution is given by:

E(X) =np=5*0.4=2

And the variance is given by:

Var(X) = np(1-p) =5*0.4*(1-0.4)=1.2

And the deviation is just the square root of the variance so we got:

Sd(X) =\sqrt{1.2}=1.095

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I believe it is commutative property cause the numbers didn't change instead they just switched places in the equation.
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