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- The International Brotherhood of Slide Whistlers wants to conduct a survey to find what proportion of its members have more than one slide whistle. If they want the margin of error to be 3% or less, how large a sample should they take? Be sure to show your work.A grocery store has determined that in crates of tomatoes, 95% carry no rotten tomatoes, 2% carry one rotten tomato, 2% carry two rotten tomatoes, and 1% carry three rotten tomatoes. Find the mean number of rotten tomatoes in the crates.An entertainment company surveyed 360 elementary school children and found that 153 of them were above grade-level readers. Find the standard error for the sample proportion of elementary school children who were above grade-level readers. Round the final answer to three decimal places. SE =