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In a bookstore, there are four bedtime storybooks available, the prices are: 34, 20, 16, 30. Randomly select two different story books. For such a

In a bookstore, there are four bedtime storybooks available, the prices are: 34, 20, 16, 30. Randomly select two different story books. For such a random sample,

1. derive the sampling distribution of the sample mean price.

2. find the mean, and variance of the sample mean price.

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