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Based on internal tests a spaghetti sauce company believes that 70% of people prefer their sauce...

Based on internal tests a spaghetti sauce company believes that 70% of people prefer their sauce to the competitor's sauce. They are going to conduct a taste test and want to have a probability of .9 or better that 60% or more of taste testers prefer their product. They are considering groups of taste testers in increments of 10, i.e., 10, 20, 30, 40, ... How many people do they need to participate in the taste test?

Please help by showing how to do it on Excel

Math   Statistics-And-Probability   
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