7.3 The colour dye used in the manufacture of certain garments fades after a mean of 96...
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7.3 The colour dye used in the manufacture of certain garments fades after a mean of 96 machine washes, with a standard deviation of 7 washes. If the number of washes before fading follows a Normal distribution, what proportion of the garments will first fade:
(a) After 100 washes?
(b) Before 90 washes?
(c) Between 95 and 105 washes?
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