The mean value of land and buildings per acre from a sample of farms is ​$1600​, with a standard deviation of ​$300. The data set has a​ bell-shaped distribution. Assume the number of farms in the sample is 75.   ​(a) Use the empirical rule to estimate the number of farms whose land and building values per acre are between ​$1300 and ​$1900.   ​(b) If 30 additional farms were​ sampled, about how many of these additional farms would you expect to have land and building values between ​$1300 per acre and ​$1900 per​ acre?

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