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alexdok [17]
3 years ago
15

What is the expression 6 times the quantity n plus 7? (there is no picture for it)

Mathematics
2 answers:
nata0808 [166]3 years ago
6 0

Answer:

Step-by-step explanation:

I think it is 6 x n+7.

If I’m not dumb.

lesantik [10]3 years ago
4 0

Answer:

it's 6n + 7

Step-by-step explanation:

hope this helped a little bit :))

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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
Summarize the rules for multiplying powers with the same base dividing powers with the same base raising a product to a power an
Mashcka [7]
The rules for multiplying powers with the same base is you are basically doing the pemdas method Please Excuse My Dear Aunt Sally pemdas
3 0
3 years ago
How are central tendency and standard deviation related
loris [4]

Answer:

Measure of central tendency is a value that represents a typical, or central, entry of a data set. The most common measures of central tendency are: • Mean (Average): The sum of all the data entries divided by the number of entries. ... The standard deviation measure variability and consistency of the sample or population.

Step-by-step explanation:

5 0
2 years ago
2. Water is leaking from a faucet at a constant rate of gallon per minute.
Alex Ar [27]
64 gallons per minute
7 0
3 years ago
The sum of two numbers is 70. the larger number is 4 more than twice the smaller number. what is the smaller number?
iVinArrow [24]
Smaller number=x
larger number=2x+4

x+2x+4=70
3x+4=70
3x=66
x=22

Smaller number=22
7 0
2 years ago
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