part 3 # 80, pg. 43
Dean had 40 math problems to complete for homework. He completed 1/4 of
them at the end of class, 1/6 of the remaining problems during lunch, and
2/5 of the rest of the problems in study hall. How many problems does he
have left to complete?
**First take 1/4 of 40...which is 10. Next, subtract 10 from 40 (40-
10=30). Then take 1/6 of 30, which is 5...(30-5=25). Now, you take 2/5 of
25 and you get 10...(25-10=15)...Dean has 15 problems to complete. answer B
****Important*****
OUTLIERS!!! DEFINITION AND EXPLANATION
An OUTLIER is commonly defined as any value of data that lies MORE THAN 1.5
IQR units BELOW the lower quartile or MORE THAN 1.5 IQR units ABOVE the
upper quartile. Using the following example, please work through this so
that you understand how to find the OUTLIERS:
-----------------------------------------------------------------------
3 4 5 6 7 8 9
4.3 5.2 5.4 5.8 6.9
Where, 5.4 is the median, 5.2 is the lower quartile and 5.8 is the upper
quartile...Now, follow this formula"
IQR = 5.8-5.2=0.6, so that 1/5 IQR units= (1.5)(0.6)=0.9
Hence, any score below 5.2-0.9 = 4.3 or above 5.8+0.9=6.7 is an
outlier.....Does this make sense?
Look at problem 12 (pg 4, part one) in your EOG practice book and apply
this principle. let me know by email if you have trouble with any of the
problems....I know you all will do great!!!
