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1) The length of skateboards follow a Normal distrubution with a mean of 30 inches and...

1) The length of skateboards follow a Normal distrubution with a mean of 30 inches and standard deviation of 2.5 inches. What percentage of skateboards fall within 27.5 and 32.5 inches?

2) The height of ten individuals are measured. The heights are listed, in inches, below. Find the IQR of the dataset.

61, 63, 65, 67, 67, 67, 68, 68, 70, 73

3) A research intends to obtain the opinion of adults in the United States on climate change. The researcher contacts 300 people, but only 100 agree to be surveyed. Identify the population and sample in this study.

Math   Statistics-And-Probability   
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