Sample size for set, n = 7
The constants d2 for n = 7 is 2.704
Standard deviation, = / d2 = 4.92 / 2.704 = 1.819527
Upper limit = + 3 / = 66 + 3 * 1.819527 / = 68.06
Lower limit = - 3 / = 66 - 3 * 1.819527 / = 63.94
Anser is,
68.06 and 63.94
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