Question
Find the numberof observation lying between $\overline{\text{X}}-\text{M.D. }$and $\overline{\text{X}}+\text{M.D. }$ is the mean deviation from the mean.
$22, 24, 30, 27, 29, 31, 25, 28, 41, 42$
$22, 24, 30, 27, 29, 31, 25, 28, 41, 42$
|
$x_i$
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$|d_i| = |x_i - 29.9|$
|
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$22$
|
$7.9$
|
|
$24$
|
$5.9$
|
|
$30$
|
$0.1$
|
|
$27$
|
$2.9$
|
|
$29$
|
$0.9$
|
|
$31$
|
$1.1$
|
|
$25$
|
$4.9$
|
|
$28$
|
$1.9$
|
|
$41$
|
$11.9$
|
|
$42$
|
$12.1$
|
|
Total
|
$48.8$
|
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