QuestionQuestion

1.      Z is a standard normal random variable. The P(-1.96 less or equal than Z less or equal than -1.4) equals
a.       0.4192
b.      0.0558
c.       0.8942
d.      0.475

2.      Given that Z is a standard normal random variable, what is the probability that Z greater or equal than -2.12?
a.       0.9830
b.      0.017
c.       0.4830
d.      0.966

3.      A major department store has determined that its customers charge an average of $500 per month, with a standard deviation of $80. Assume the amounts of charges are normally distributed. What percentage of customers charges between $644 and $700 per month? SHOW WORK
a.       99.38%
b.      3.59%
c.       96.41%
d.      2.93%

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