Practice B: Ungrouped Problems
The principal wants to know the lower quartile, 5th decile and 75th percentile in the

distribution which shows the number of years of service of 20 school teachers.

4, 20, 21, 5, 10, 10, 23, 25, 30, 11, 16, 17, 17, 18, 19, 20, 6, 6, 7, 8,

1. Make an array for the number of years of service of 20 school teachers

2. Find the value of 1, 5 and 75. For each measure of position, determine the

following and then, interpret.

a. Position of the quantile (1 ,5 ,75 )

b. Given: d, L, H

c. Solution for Interpolation

d. Conclusion

e. Interpretation

3. Mr. Luna is one of the school teachers. His number of years of service is at the

upper quartile.

a. How many years of service did Mr. Luna render as a school teacher?

b. How many teachers have years of service lower than Mr. Luna’s?

c. How many teachers have years of service equal to or higher than Mr. Luna’s?

4. Mrs. Palo rendered 17 years of service as a school teacher. What is the percentile rank of Mrs. Palo?
ASAP PLEASE