Answer:
n = 4
Step-by-step explanation:
Tell me if you need a explanation.
Answer:
The standard deviation of the sample mean is
Step-by-step explanation:
From the question we are told that
The mean is ![\= x = 60](https://tex.z-dn.net/?f=%5C%3D%20x%20%20%3D%20%2060)
The standard deviation is ![\sigma = 21](https://tex.z-dn.net/?f=%5Csigma%20%20%3D%20%2021)
The sample size is ![n = 60](https://tex.z-dn.net/?f=n%20%20%3D%20%2060)
Generally the standard deviation of the sample mean is mathematically represented as
![\sigma _ {\= x } = \frac{\sigma }{\sqrt{n} }](https://tex.z-dn.net/?f=%5Csigma%20_%20%7B%5C%3D%20%20x%20%7D%20%3D%20%20%5Cfrac%7B%5Csigma%20%20%7D%7B%5Csqrt%7Bn%7D%20%7D)
substituting values
![\sigma _ {\= x } = \frac{ 21 }{\sqrt{60} }](https://tex.z-dn.net/?f=%5Csigma%20_%20%7B%5C%3D%20%20x%20%7D%20%3D%20%20%5Cfrac%7B%2021%20%7D%7B%5Csqrt%7B60%7D%20%7D)
![\sigma _ {\= x } = 2.711](https://tex.z-dn.net/?f=%5Csigma%20_%20%7B%5C%3D%20%20x%20%7D%20%3D%202.711)
Answer:
D)
Step-by-step explanation:
Answer:
Step-by-step explanation:
This is an order of operations question. First in PEMDOS you want to do your parenthesis, turn (5-2) into 3,
15 ÷ 3 + 4
Then do your divison, turning 15 ÷ 3 into 5
5 + 4
Then finish with 5 + 4
The answer is 9
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