Created
December 13, 2012 09:58
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MIT 6.00x - MidTerm2 answers by jonrsharpe
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# Problem 4-2 | |
class edXPerson(Person): | |
nextIdNum = 0 | |
def __init__(self, name): | |
Person.__init__(self, name) | |
self.idNum = edXPerson.nextIdNum | |
edXPerson.nextIdNum += 1 | |
def getIdNum(self): | |
return self.idNum | |
def __lt__(self, other): | |
if isinstance(self, SelfLearner): | |
return self.name < other.name | |
return self.idNum < other.idNum | |
def isStudent(self): | |
return isinstance(self, Student) | |
# Problem 4-3 | |
class Subject(object): | |
def __init__(self): | |
self.students = [] | |
def addStudent(self, student): | |
if student in self.students: | |
raise ValueError('Duplicate student') | |
self.students.append(student) | |
def allStudents(self): | |
for student in sorted(self.students): | |
yield student | |
def __str__(self): | |
return 'Subject with ' + str(len(self.students)) + ' students.' | |
# Problem 7-1 | |
def sampleQuizzes(): | |
return sum(70 <= ((0.25 * random.randint(50, 80)) + | |
(0.25 * random.randint(60, 90)) + | |
(0.5 * random.randint(55, 95))) <= 75 | |
for __ in range(10000)) / float(10000) | |
# Problem 7-2 | |
def plotQuizzes(): | |
results = generateScores(10000) | |
pylab.hist(results, bins=7) | |
pylab.title("Distribution of Scores") | |
pylab.xlabel("Final Score") | |
pylab.ylabel("Number of Trials") | |
pylab.show() | |
# Problem 8-2 | |
def probTest(limit): | |
n = 1 | |
while ((5 ** (n - 1)) / float(6 ** n)) > limit: | |
n += 1 | |
return n |
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