Class XII

A certain tree farm grew 4-, 5- and 6-foot trees. It grew 150 4-foot trees, 450 5-foot trees, and 400 6-foot trees. What was the average height of a tree that the farm grew? (Note: 1 foot = 12 inches.)
  1. 5 feet, 1 inch
  2. 5 feet, 3 inches
  3. 5 feet, 4 inches
  4. 5 feet, 6 inches
A set of data is approximately normally distributed. In order from highest to lowest, list the range, the Interquartile Range (IQR), and the standard deviation.
  1. Range, IQR, Standard Deviation
  2. IQR, Range, Standard Deviation
  3. Range, Standard Deviation, IQR
  4. Standard Deviation, Range, IQR
Suppose each employee in a company receives a $3,000 raise for next year. The median salary for the employees receiving the raise will
  1. be unchanged.
  2. be multiplied by $3,000.
  3. increase by $1500
  4. increase by $3,000.
A high school receives the final scores of all students at the school who took the AP History exam last month. The assistant principal computes the mean and the standard deviation of the scores and presents her final data report to the principal. Wh
  1. Parameters x̅ and S because the scores come from a sample
  2. Statistics x̅ and S because the scores come from a sample
  3. Parameters μ and σ , because the scores come from a population
  4. Statistics μ and σ , because the scores come from a population
The following data set has a mean of 12 and no mode. All values are positive integers, and the data are listed in ascending order. What is the largest possible value for a? :- a b c 12 17 20
  1. 1
  2. 2
  3. 4
  4. 6
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