Answer to Question #40890 in Statistics and Probability for sandile

Question

The records of 400 examinees are given below:
Score
Educational Qualification
Total
Diploma
Degree
I.T
Below 50
90
30
60
180
Between 50 and 60
20
70
70
160
Above 60
10
30
20
60
Total
120
130
150
400
If an examineer is selected at random from this group, find:
1.1.1 The probability that he is a Diploma graduate.
1.1.2 The probability that he is a Degree graduate, given that his scores are above
60.
1.1.3 The probability that his score is below 50, given that he’s doing IT.
1.2 A marketing manager makes the statement that the long-run probability that a
customer would prefer the deluxe model to the standard model is 30%.
1.2.1 What is the probability that exactly 3 in a random sample of 10 customers will
prefer the deluxe model?
1.2.2 What is the probability that more than 2 in a random sample of 10 customers
will refer the standard model?

Answer 1

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