The table below gives​ information, broken down by year in​ college, about the number of credit hours for which students are enrolled. What is the probability that a student selected at random is a sophomore or is taking between 11 and 13​ hours? Round to two decimal places.     14 or more hours ​11-13 hours 10 or less hours   TOTALS Freshmen 237   377   386   1,000   Sophomores 327   360   423   1,110   Juniors 57   325   162   644   Seniors 114   276   92   482   TOTALS 835   1,338   1,063   3,236

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 15CR
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The table below gives​ information, broken down by year in​ college, about the number of credit hours for which students are enrolled. What is the probability that a student selected at random is a sophomore or is taking between 11 and 13​ hours? Round to two decimal places.
 
 
14 or more hours
​11-13 hours
10 or less hours
 
TOTALS
Freshmen
237
 
377
 
386
 
1,000
 
Sophomores
327
 
360
 
423
 
1,110
 
Juniors
57
 
325
 
162
 
644
 
Seniors
114
 
276
 
92
 
482
 
TOTALS
835
 
1,338
 
1,063
 
3,236
 
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