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Using Chebyshev’s Theorem, at least what percentage of observations lie within k = 2 standard deviations of the mean?

A histogram shows:

The proportion of all South Carolina voters supporting a candidate is a:

Which graph uses adjacent bars?

A poll includes 300 registered voters selected from South Carolina. The 300 voters represent:

Temperatures measured in Fahrenheit are:

Data: 10, 20, 30, 40, 50. What is the median?

Data range from 30 to 78. Using 6 classes, the class width is approximately:

Which variable is qualitative?

Using Chebyshev’s Theorem, at least what percentage of observations lie within k = 3 standard deviations of the mean?