x

P(x)


Below 60

0.03

60dash–64

0.07

65dash–69

0.18

70dash–74

0.26

75dash–79

0.23

80dash–84

0.09

85dash–89

0.07

90dash–94

0.03

95dash–99

0.03

100 or above

0.01

Explanation:
The probability that X is less than 90 is the same as the probability that X takes a value up to 89, that is, P (X < 90) = P (X ≤ 89).
From the given table, this probability can be obtained by adding all the probabilities, that is, all the P (x) val...
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