Mathematics, 09.10.2021 21:50 phyllides4930
Of the 200 envelopes carried by a mail track, 120 are from city K and the rest are from city J. Forty percent of the envelopes from city K are birthday cards, and thirty percent of the envelopes from city J are birthday cards. A random sample of 20 envelopes is randomly selected from the mail track. Find the variance of the number of birthday cards among a 20 randomly selected envelopes from this mail track.
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Of the 200 envelopes carried by a mail track, 120 are from city K and the rest are from city J. Fort...
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