the mean value of land and buildings per acre from sample of farms is $1200, with a standard deviation of $200. the data set has a bell-shaped distribution. assume the number of farms in the sample is 76. use the empirical fule to estimate the number of farms whose land and building values per acre ae between $800 and $1600 and if 24 additional farms were sampled, about how many of these additional farms would you expect to have land and building values between $800 per acre and $1600 per acre?