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3 years ago

I don’t know what to do after this

Mathematics

2 answers:

aalyn [17]3 years ago

8 0

Simplify 123/8 then multiply 5/8 and x2 then add those two and subtract 6 sry if it's confusing

coldgirl [10]3 years ago

3 0

Yeah what he/she said

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A store sells a television for $1000. There are two payment options. Which option is better? ( PLS HELP!! I'M RLY STRUGGLING!! :

serious [3.7K]

One of the options is $500+$500

7 0

3 years ago

A theory predicts that the mean age of stars within a particular type of star cluster is 3.3 billion years, with a standard devi

Luden [163]

Answer:

Null hypothesis: $\mu \leq 3.3$

Alternative hypothesis: $\mu > 3.3$

$z=\frac{3.4-3.3}{\frac{0.4}{\sqrt{50}}}=1.768$

Since is a one right tailed test the p value would be:

$p_v =P(z>1.768)=0.039$

Step-by-step explanation:

Data given and notation

$\bar X=3.4$ represent the sample mean

$\sigma=0.4$ represent the population deviation for the sample

$n=50$ sample size

$\mu_o =3.3$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses to be tested

We need to conduct a hypothesis in order to determine if the mean is higher than 3.3, the system of hypothesis would be:

Null hypothesis: $\mu \leq 3.3$

Alternative hypothesis: $\mu > 3.3$

Compute the test statistic

We know the population deviation, so for this case is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

We can replace in formula (1) the info given like this:

$z=\frac{3.4-3.3}{\frac{0.4}{\sqrt{50}}}=1.768$

P value

Since is a one right tailed test the p value would be:

$p_v =P(z>1.768)=0.039$

6 0

3 years ago

Bill furrier marks up minks coats $3000. This represents 50% mark up cost. What is the cost of the coats?

Romashka [77]

1500. since hes marking it up by 50% then take half of 3000 to get your answer

4 0

4 years ago

Write a number that has four digits with the same number in all places such as 4444 circle the digit with the greatest value und

joja [24]

For example you can take the number 7 7 7 7

(7)77{7}

The first seven is the greatest it's 7,000

The last seven is the least its 7

HOPE THIS HELPS!!!

4 0

4 years ago

You are in $33 in eight hours at that rate how much would you earn in five hours

svp [43]

Answer:

20.625 dollars or about 20.63 dollars

Step-by-step explanation:

33/8 = 4.125

4.125 times 5 = 20.625

4 0

4 years ago