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Usimov [2.4K]
3 years ago
13

Whats an explicit formula for 3 + 10 + 17 + 24 + ...

Mathematics
1 answer:
MrRa [10]3 years ago
6 0
7(x-1)+3 where x is how many numbers are being added together
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Dalin is 16 years old hey sister is 3/4 of his age How old is his sister
Solnce55 [7]

Answer:

12

Step-by-step explanation:

if 4x4 is 16 and we want to know what is 3/4 of that then we can easily just subtract 4 from it

8 0
3 years ago
A study wanted to assess the accuracy of self-reported smoking status. Participants are asked whether they currently smoke or no
HACTEHA [7]

Answer: a) 0.7878, b) 0.8723

Step-by-step explanation:

Since we have given that

                                              Nicotine present      Nicotine absent

Self-reported non smoker                  82                                      14

Self-reported smoker                          12                                      52

(a) What is the sensitivity of the self-reported smoking status?

P(smoker|Nicotine\ present)=\dfrac{52}{52+14}=\dfrac{52}{66}=0.7878

(b) What is the specificity of the self-reported smoking status?

P(Non-smoker|Nicotine\ absent}=\dfrac{82}{82+12}=\dfrac{82}{94}=0.8723

Hence, a) 0.7878, b) 0.8723

4 0
3 years ago
What is the greatest common factor for 5 4 and 2
aleksandrvk [35]
Factors of 5,1     factors of 4,2,1    factors of 2,1
6 0
3 years ago
Read 2 more answers
What is the simplified expression for 3 to the power of negative 4 multiplied by 2 to the power of 3 multiplied by 3 to the powe
vlabodo [156]
Ok first look at just the base 2s. 2^3/2^4 is 1/2
Then 3^-4*3^2/3^-3 is 3^-2/3^-3 is 3^3/3^2 is 3
Therefore the answer is 3/2
3 0
3 years ago
The mean gross annual incomes of certified welders are normally distributed with the mean of $20,000 and a standard deviation of
masya89 [10]

Answer:

Z=±1.65

Step-by-step explanation:

Some previous concepts

The p-value is the probability of obtaining the observed results of a test, assuming that the null hypothesis is correct.

A z-test for one mean "is a hypothesis test that attempts to make a claim about the population mean(μ)".

The null hypothesis attempts "to show that no variation exists between variables or that a single variable is no different than its mean"

The alternative hypothesis "is the hypothesis used in hypothesis testing that is contrary to the null hypothesis"

System of hypothesis

Null hypothesis: \mu=20000

Alternative hypothesis: \mu \neq 20000

If the random variable is distributed like this: X \sim N(\mu=20000,\sigma=2000)

The significance level provided is \alpha=0.1 and the value of \alpha/2= 0.05.

Since we are conducting a bilateral test, then we have two critical values. We need to find two quantiles that accumulates 0.05 of the area on the tails of the normal standard distribution. And in order to find it we can use the following excel codes:

"=NORM.INV(0.05,0,1)" , "=NORM.INV(1-0.05,0,1)"

And we got this:

z_{\alpha/2}=-1.65 and z_{1-\alpha/2}=1.65

So the correct answer for this case is:

Z=±1.65

8 0
3 years ago
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