Errata – Word Problems, 3rd Edition

Cover for 3rd Edition

3.0

Page	Location	Description	Erroneous Text	Correction
32	Top	Typo in Step 1	…that contain teo distinct but related…	…that contain two distinct but related…
60	Middle	#5 Typo	The simplest choice is 19 miles for this distance.	The simplest choice is 18 miles for this distance.
65	Middle	#4 typo	r = 7/10 ÷ 6 = 7/10 buckets per minute	r = 7/10 ÷ 6 = 7/60 buckets per minute
69	Top	#15 answer typo	15 (A):	15. (B):
69	Bottom	#15 last line of explanation	…reach its destination.	…reach its destination and Quantity B is greater.
91	Bottom	Bullet point unclear, including wrong signs or missing parentheses	Roughly 2/3 of the sample … (entire bullet point)	Roughly 2/3 of the sample will fall within 1 standard deviation of the mean.  That means that roughly 1/3 of the sample falls within 1 standard deviation below the mean and roughly 1/3 of the sample falls within 1 standard deviation above the mean.  Thus, in the example above, a value of 6 is at roughly 50% – (1/2)(2/3) = 17%, or the 17th percentile.  A value of 14 is at roughly 50% + (1/2)(2/3) = 83%, or the 83rd percentile.
91	Bottom	Bullet point unclear, including wrong signs or missing parentheses	Roughly 96% of the sample … (entire bullet point)	Roughly 96% of the sample will fall within 2 standard deviations of the mean.  In other words, roughly 48% of the sample falls between the mean and 2 standard deviations below the mean; roughly 48% of the sample falls between the mean and 2 standard deviations above the mean.  Thus, in the example above, a value of 2 will be at 50% – (1/2)(96%) = 50% – 48% = 2%, or the 2nd percentile.  A value of 18 will be at 50% + (1/2)(96%) = 50% + 48% = 98%, or the 98th percentile.
93	Middle	#6 Typo	Weighted Average = 2/3(120) + 1/3(120)	Weighted Average = 2/3(120) + 1/3(180)
109	Middle	#6 clarity	Mario’s Pizza has two choices of crust: deep dish and thin and crispy.	Mario’s Pizza has two choices of crust: deep dish or thin crust.