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DerKrebs [107]
3 years ago
12

What is 22 times 2 do it quickly

Mathematics
2 answers:
Sedaia [141]3 years ago
8 0
The answer is 44
For sure it is 44
PtichkaEL [24]3 years ago
4 0
The answer to your is 44

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An article written for a magazine claims that 78% of the magazine's subscribers report eating healthily the previous day. Suppos
Schach [20]

Answer:

89.44% probability that less than 80% of the sample would report eating healthily the previous day

Step-by-step explanation:

We use the binomial approximation to the normal to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

E(X) = np

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that \mu = E(X), \sigma = \sqrt{V(X)}.

In this problem, we have that:

p = 0.78, n = 675

So

\mu = E(X) = np = 675*0.78 = 526.5

\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{675*0.78*0.22} = 10.76

What is the approximate probability that less than 80% of the sample would report eating healthily the previous day?

This is the pvalue of Z when X = 0.8*675 = 540. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{540 - 526.5}{10.76}

Z = 1.25

Z = 1.25 has a pvalue of 0.8944

89.44% probability that less than 80% of the sample would report eating healthily the previous day

8 0
3 years ago
The factored form of a quadratic equation is y=(2x+1)(x-5), and the standard form is y=2x²-9x-5. Which of the following statemen
podryga [215]

x1= -5 x2=0.5 y= -5

the answer is b as the minuses can be interchanged for the x intercepts

Step-by-step explanation:

As you can see as explained in the pictures

7 0
2 years ago
Use your equation from Exercise 6 to find m when n=40
Andreyy89

Answer:

=4/5(N+7)N

Step-by-Step Explanation:

We move all terms to the left:

-(4/5(N+7)N)=0

Domain of the equation: 5(N+7)N)!=0

N∈R

We multiply all the terms by the denominator

-(4=0

We add all the numbers together, and all the variables

=0

N=0/1

N=0

5 0
2 years ago
How to make 105% into a fraction?
riadik2000 [5.3K]
Percent measn parts out of 100
105%=105/100=21/20
3 0
3 years ago
Mr Thompson please answer. This is hw that is for mathematics Algebra.
ddd [48]

Answer:

question 6:

x^{2} + 9x + 14 and (x + 2) (x + 7)

question 7:

x^{2} - 7x + 10 and (x - 2)(x - 5)

question 8:

x^{2} - 9x + 20 and (x - 4)(x - 5)

question 9:

(x + 1) (x - 17)

x^{2} - 17x + 1x - 17

x^{2} - 16x - 17

question 10:

(x - 1) (x + 17)

x^{2} + 17x - 1x - 17

x^{2} + 16x - 17

6 0
3 years ago
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