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4 years ago

If 4y = 20 then 2y - 1 equals what number

Mathematics

2 answers:

inessss [21]4 years ago

3 0

$4y=20\\20\div4=5\\y=5\\\\2y-1;y=5\\2\times5-1\\10-1\\\boxed9\\\\\star\bowtie\star$

const2013 [10]4 years ago

3 0

4y = 20
y = 20 / 4
y = 5

2y - 1 = ?
2(5) - 1 = ?
10 - 1 = 9

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What is the answer for 4n < -20

kotegsom [21]

The answer would end up being n<-5

Step-by-step explanation:

4n/4 < -20/4

=<-5

8 0

3 years ago

Suppose that we wish to assess whether more than 60 percent of all U.S. households in a particular income class bought life insu

Yakvenalex [24]

Answer:

a) The probability is P=0.3982.

b) No. There is no enough evidence to say that the proportion of the population is not 0.6.

Step-by-step explanation:

a) In this question, we have a sample of the population, of size n=1000. To know what is the probability of observing a sample proportion that is at least 0.64 we have to know the parameters of the sampling distribution.

The parameters of the sampling distribution of the proportion will be:

$\mu=\pi=0.6\\\\ \sigma=\sqrt{\frac{\pi(1-\pi)}{N} } =\sqrt{\frac{0.6(1-0.6)}{1000} }= 0.0155$

With these parameters, we can calculate the z-value for p=0.64 as:

$z=\frac{p-\pi}{\sigma}=\frac{0.64-0.6}{0.0155}= 0.258$

Then, we can calculate the probability of having a sample with p≥0.64:

$P(p\geq0.64)=P(z\geq0.258)=0.3982$

b) To know if the proportion of the population is greater than 0.6 the rigth thing to do is perform a hypothesis test, in which we test the following hypothesis:

$H_0: \pi\leq0.6\\\\H_1:\pi>0.6$

If the null hypothesis is rejected, we can conclude that there is evidence that the proportion of the population is greater than 0.6.

First, we assume a significance level of 0.05.

Second, we calculate the z value:

$z=\frac{p-\pi-0.5/N}{\sigma} =\frac{0.64-0.6-0.5/1000}{0.0155} =\frac{0.0395}{0.0155} =2.54$

The P-value for this z is P=0.4. The P-value is greater than the significance level, what means that there is no evidence to reject the null hypothesis.

In other words, a sample mean of 0.64 is a quite probable value even if the proportion of the population is 0.6.

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3 years ago

If p is true and q is false, the p q is ________ true.

Paraphin [41]

I would guess sometimes, but I'm not sure how something can be true and false at the same time. If something is both true and false it won't always be true and it won't never be true, so I'm guessing it's sometimes.

8 0

4 years ago

Read 2 more answers

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Step-by-step explanation:

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Dominik [7]

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