501 Questions To Master GED Test Mathematics_pag367

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501 Questions to Master the GED® Mathematical Reasoning Test
 478. The correct answer is choice d. Note that the color and the type 
of bike seat do not factor into how the bike is chosen when ask-
ing for the probability that the bike chosen is a mountain bike. So, 
since there is an equal likelihood of choosing any of the three types 
of bikes, the probability of randomly choosing a mountain bike is 
1__
3 . 
 Choice a is incorrect because this would insist on a specific struc-
ture, color, and type of bike seat. 
 Choice b is incorrect because this would insist on a specific type of 
seat. 
 Choice c is incorrect because this would insist on a specific color. 
 479. The correct answer is choice b. Put the nine ring scores in order 
from least to greatest. The middle value (the fifth value) is the 
median score:
 3, 3, 3, 4, 4, 5, 6, 8, 9
 The median score 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 great-
est.
 Choice c is incorrect because you confused the game numbers for 
the data and you selected the middle game number, when you were 
asked to find the median score. 
 Choice d is incorrect because although it is the middle number 
of ring scores in the table as they are listed, the data must first be 
arranged from least to greatest before determining the median, 
and you forgot this critical step. 
 480. The correct answer is choice d. Arrange the data in increasing 
order. The median of the original data set is 168, and replacing 320 
by 350 does not change this value since 168 remains the middle 
value in the data set. The mean, however, will increase since the 
sum of the data has increased. 
 Choices a and c are incorrect because the median remains 
unchanged since it is concerned with position within the data set, 
and replacing 320 by 350 does not change this. 
 Choice b is incorrect because the mean will increase since it is 
obtained by summing the values and dividing by the same 
number, 7.
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