Which of the following choices is the standard deviation of the sample shown here18, 19, 20, 21, 22A) 2.5B) 20C) /2.5D) /2E) 2
Question
Answer:
Answer:(D)Step-by-step explanation:The given data set is:18, 19, 20, 21, 22Mean of the given data set is given as:[tex]Mean=\frac{18+19+20+21+22}{5}[/tex][tex]Mean=\frac{100}{5}[/tex][tex]Mean=20[/tex]Now, Data values [tex](x-{\overline{x})^2[/tex]18 419 120 021 122 4Now, variance is given as:[tex]V=\frac{4+1+0+1+4}{5}[/tex][tex]V=2[/tex]The standard deviation is the square root of the variance, thus[tex]SD=\sqrt{V}[/tex][tex]SD=\sqrt{2}[/tex]Thus, option (D) is correct.
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