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Question: a recent study of 35 students were asked the cost...

Question details

A recent study of 35  students were asked the cost of their monthly internet charges.  The results are shown in the following table:

Cost ($)

Frequency (f)

Number of students

40-49

5

50-59

8

60-69

16

70-79

4

80-89

2

Calculate:  (a) the mean [Answer to 2 dp]

(b) the standard deviation [Answer to 2 dp]

(c) the interquartile range [Answer to whole number]

 

2.For the standard normal distribution, find:

P(0<z<1.25)

 

3.The probability of having a baby boy is 0.5.  In a family of 5 children what is the probability that all 5 will be boys? [Give answer to 4 decimal places]

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