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3 years ago

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BRAINTEASER MATH 1. Multiple me by 20 and the awnser is 10 what am i________ 2.I am a prime number over 70 and less then 80 what

am i ________3. i am the largest 3 digit number that can be rounded up too 1000 what am i ________

1 answer:

IgorC [24]3 years ago

8 0

1) 0.5 , 2)<span>71 or 73 or 79 , 3) well i would say 999</span>

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Answer:

$z=\frac{10.6-12}{\frac{4.1}{\sqrt{45}}}=-2.29$

Step-by-step explanation:

information given

$\bar X=10.6$ represent the sample mean

$\sigma=4.1$ represent the population standard deviation

$n=45$ sample size

$\mu_o =12$ represent the value that we want to test

$\alpha=0.05$ represent the significance level for the hypothesis test.

z would represent the statistic

$p_v$ represent the p value for the test

Hypothesis to test

We want to test if the true mean is less than 12, the system of hypothesis would be:

Null hypothesis: $\mu \geq 10$

Alternative hypothesis: $\mu < 10$

The statistic is given by:

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

Replacing the info given we got:

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

$z=\frac{10.6-12}{\frac{4.1}{\sqrt{45}}}=-2.29$

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