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yuradex [85]
3 years ago
14

Students of a large university spend an average of $5 a day on lunch. The standard deviation of the expenditure is $3. A simple

random sample of 36 students is taken. a) What is the expected value, standard deviation, and shape of the sampling distribution of the sample mean
Mathematics
1 answer:
Nikolay [14]3 years ago
5 0

Answer and Step-by-step explanation:

According to the situation the solution is shown below:-

The expected value is

\mu = 5

The standard deviation is

= $3

The sample distribution of the sample standard deviation is

\sigma_x = \frac{\sigma}{\sqrt{n} } \\\\ = \frac{3}{\sqrt{36} } \\\\ = \frac{3}{6}

After solving the above equation  we will get

= 0.5

Basically we applied the applied formula so that each part could be determined

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We know that the price of all the fabrics is the same. However, the length of the fabrics is different. We have to determine which fabric is the longest.

Option A: \frac{43}{5}  = 8.6

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3 years ago
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Consider U = {x|x is a real number}. A = {x|x ∈ U and x + 2 > 10} B = {x|x ∈ U and 2x > 10} Which statements are true? 5 ∉
-Dominant- [34]

x+2 > 10 solves to x > 8 after we subtract 2 from both sides

So set A is the set of real numbers that are larger than 8. The value 8 itself is not in set A. The same can be said about 5 as well.


Set B is the set of values that are larger than 5 since 2x > 10 turns into x > 5 after dividing both sides by 2. The value x = 5 is not in set B since x > 5 would turn into 5 > 5 which is false. The values x = 6, x = 8, and x = 9 are in set B.


----------------


Summarizing everything, we can say...

5 is not in set A. True

5 is in set B. False

6 is in set A. False

6 is not in set B. False

8 is not in set A. True

8 is in set B. True

9 is in set A. True

9 is not in set B. False


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3 years ago
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How do I do this? it doesn't make sense. ​
yuradex [85]
I think you subtitute de 34 by x not sure
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Step-by-step explanation:

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