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?

   Hint (a):

   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 $10$ or more years? Write the probability in two different ways.

   Hint (b):

   Based on the histogram, how many teachers have been teaching for more than $10$ years? Orange shading added to the last 3 bars.

   More Help (b):

   How can this fraction probability be represented as a percent? 

   Answer (b):

   $\frac{7}{24}$ or $\approx29\%$

   

   

3. What is the probability that a teacher on the staff has been there for fewer than $5$ years?

   Hint (c):

   Based on the histogram, how many teachers have been teaching for less than $5$ years? Blue shading added to the first bar, removed orange shading on last 3 bars.