A manufacturer of envelopes known that the weight of the envelopes is norma
A manufacturer of envelopes known that the weight of the envelopes is normally distributed with mean 1.9 gm and variance 0.01 gm. Find how many envelops weighting (i) 2 gm or more (ii) 2.1 gm or more can be expected in a given packet of 1000 envelopes
