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n 7. The mass (M) in grams of a packet of sweets is modelled as M ' N(100, a). If approximately 95% of the packets

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7. The mass (M) in grams of a packet of sweets is modelled as M "' N(100, a\"). If approximately 95% of the packets have mass between 94 and 1063, estimate the value of ate the nearest whole number. 8. A random variable X is normally distributed with mean 60 and standard deviation 10. a) Find P(X 65). c) Find the value of the lower quartile d) Find the value ofa such that P(55

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