A greenhouse in a tri-county area has kept track of its customers for the last several years and has determined that 28% of its customers plant a vegetable garden in the spring. The greenhouse obtains a random sample of 1000 of its customers. What is the mean of the sampling distribution of p, the sample proportion of custome that plant a vegetable garden in the spring? OA. 0.28 OB. 0.002 OC. 2800 OD. 0.72

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