Quiz 7.2C
The weight of medium-sized tomatoes selected at random from a bin at the local supermarket is a random variable with mean 10 ounces and standard deviation 1 ounce.
1. Suppose we pick four tomatoes from the bin at random and put them in a bag. Let X = the weight of the bag. Find the mean of the random variable, X.
2. Calculate the standard deviation (in ounces) of X.
3. The weight of the tomatoes in pounds (1 pound = 16 ounces) is a random variable, say Y. Determine the standard deviation of Y.
4. Suppose we pick two tomatoes at random from the bin. The difference in the weights of the two tomatoes selected (the weight of the first tomato minus the weight of the second tomato) is a random variable, W. Find the mean and standard deviation (in ounces) of W.
AP Statistics Quiz 7.2C tomato question?
1. 10
2. 1/2
3. .791
4. mean=20, sd=.707
pretty sure about this, but not 100%
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