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(7). A store sells jewellery, the average number of sold jewellery is 3 per day. Let X be the number of daily sold jewellery. Assume

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(7). A store sells jewellery, the average number of sold jewellery is 3 per day. Let X be the number of daily sold jewellery. Assume the number of sold jewellery is independent each day, and the probability of selling a jewellery in each day is the same. For one randomly selected day, find the probability that the number of sold jewellery is between 4 to 6, inclusive

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