If a certain sample of data has a mean of 21.0 and the value 42.0 is more than 2.5 standard deviations from the mean, which of the following could be the standard deviation of the sample
Choose the most appropriate option.
A) 8.3  B) 7.3  C) 7.5  D) 6.5  E) 6.2
42.0 is more than 2.5 standard deviations from 21 --&gt; 42 &gt; 21 + 2.5*{SD} --&gt; 2.5*{SD} &lt; 21 --&gt; {SD} &lt; 8.4. Only option A offers the standard deviation less than 8.4.   8.3nswer: 8.3
<result>A</result>
If a certain sample of data has a mean of 21.0 and the value 42.0 is more than 2.5 standard deviations from the mean, which of the following could be the standard deviation of the sample