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MAT 120 5-6: Histogram and Standard Deviation

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5. The following data represents height (cm) for students in a particular class.
a. Is the histogram symmetric, left skewed or right skewed?
b. Is the histogram unimodal, bimodal, or multimodal? 

c. Would you expect the mean height (cm) to be smaller, larger, or about equal to the median height (cm) for these students? About how many students were less than 122 cm tall? What percent of students were at least 127 cm tall? Round to two decimal places.

6. The number of minutes all employees spend on the phone during their 8 hour work day for a small company is listed below. Calculate the standard deviation for this data. Be sure to show all work and calculations. Round answer to four decimal places
Number of minutes: 48, 52, 61, 33, 28

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All solutions, tables and computations for the histogram and standard deviation example questions are in the files attached.

Solution provided by:
J Pye, MSc
Education
  • MSc, California State Polytechnic University, Pomona
  • MBA, University of California, Riverside
  • BSc, California State Polytechnic University, Pomona
  • BSc, California State Polytechnic University, Pomona
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