Mathematics: A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean is: a. 1.875 b. 40 c. 5 d. 15 e. None of the above

A simple random sample of 64 observations was taken

blkrosesss

10.02.2022

The correct option is d

Step-by-step explanation:

From the question we are told that

The sample size is n = 64

The mean is $\= x = 320$

The standard deviation is $\sigma = 120$

Generally the standard error of the mean is mathematically represented as

$\sigma_x = \frac{\sigma}{ \sqrt{n} }$

=> $\sigma_x = \frac{120}{ \sqrt{64} }$

=> $\sigma_x =15$

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bskyeb14579

26.01.2020

The original price of the bike was 400.

If you multiply 400 by .65 it equals out to 260

Step-by-step explanation:

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