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46, 54, 58, 67, 77, 79, 97, 98, 99 The list above shows the scores of
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16 Jan 2024, 03:10
16 Jan 2024, 03:10
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46, 54, 58, 67, 77, 79, 97, 98, 99
The list above shows the scores of 9 students obtained on a scheduled test. If the standard deviation of the 9 scores is 19.51, how many of the scores are greater than one standard deviation above the mean of the 9 scores?
(A) One
(B) Two
(C) Three
(D) Four
(E) Five
The list above shows the scores of 9 students obtained on a scheduled test. If the standard deviation of the 9 scores is 19.51, how many of the scores are greater than one standard deviation above the mean of the 9 scores?
(A) One
(B) Two
(C) Three
(D) Four
(E) Five
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46, 54, 58, 67, 77, 79, 97, 98, 99 The list above shows the scores of
[#permalink]
17 Jan 2024, 00:42
17 Jan 2024, 00:42
1
The mean of the 9 scores is
\((46+54+58+67+77+79+97+98+99)/9 = 75\)
One standard deviation above the mean is \(19.51+75=94.51\)
The scores 97, 98, and 99 are greater than 94.51.
\((46+54+58+67+77+79+97+98+99)/9 = 75\)
One standard deviation above the mean is \(19.51+75=94.51\)
The scores 97, 98, and 99 are greater than 94.51.
gmatclubot
46, 54, 58, 67, 77, 79, 97, 98, 99 The list above shows the scores of [#permalink]
17 Jan 2024, 00:42
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