501 Questions To Master GED Test Mathematics_pag351

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501 Questions to Master the GED® Mathematical Reasoning Test
Answers and Explanations
 436. The correct answer is choice c. The mode is the number that 
appears most frequently. This data set has three modes because 12, 
45, and 56 each occur twice, more than any of the other numbers. 
 Choice b is the correct median of this data set, but not the mode. 
(It is the central piece of data when it is listed in increasing order.) 
 Choice a is the incorrect median of this data set. (It’s in the middle 
of the data set as the data is presented, but the data was not put into 
increasing order.) 
 Choice d is the maximum of the data set but not the mode.
 437. The correct answer is choice c. The median of a data set is the 
piece of data that occurs right in the middle after the data is put 
in order. To find the median number of hours Phoebe will work 
in one day over the next three weeks, put the number of hours she 
works each day in order and choose the number in the middle:
 0, 0, 0, 0, 0, 0, 0, 2, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7
 There are 21 days on the schedule, so the middle number is the 
eleventh number shown, 4. The median number of hours Phoebe 
will work is 4.
 Choice a is incorrect because you confused the mode with the 
median. The mode is the most common data entry but the median 
is the middle data entry when the data is listed from least to 
greatest.
 Choice b is incorrect because you confused the mean with the 
median. The mode is the most common data entry but the median 
is the middle data entry when the data is listed from least to great-
est, but you calculated the mean which is the arithmetic average. 
 Choice d is incorrect because although it is the middle number in 
the data set as it is listed, the data must first be arranged from least 
to greatest before determining the median and you forgot 
this critical step. 
501_MathQues_09_313-362.indd 336 7/26/17 4:04 PM