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Home > CC3MN > Chapter 9 > Lesson 9.1.7 > Problem 9-103

9-103.

A histogram with x axis labeled, Years of Teaching, scaled in equal segments of 5, from 0 to 25.  Y axis labeled, Frequency, scaled by ones, from 0 to 11. Starting at the left, each segment has the following bar heights: 7, 10, 4, 1, and 2.A principal made the histogram at right to analyze how many years teachers had been teaching at her school.  

  1. How many teachers work at her school?

    Add up the frequencies represented by the bars. How many total teachers are there?

  2. If the principal randomly chose one teacher to represent the school at a conference, what is the probability that the teacher would have been teaching at the school for or more years? Write the probability in two different ways.

    Based on the histogram, how many teachers have been teaching for years or more?

    The same histogram with the left 2 bars shaded a different color from the right 3 bars.

    How can this probability be represented as a fraction and a percent?

  3. What is the probability that a teacher on the staff has been there for fewer than years?

    Based on the histogram, how many teachers have been teaching for less than years?

    The same histogram with the left bar shaded a different color from the right 4 bars.