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Explanation:

Probability that the LPG will last ≥ 60 days = 0.8

∴ Probability that the LPG will last < 60 days = 1 – 0.8 = 0.2

Probability that the LPG will last ≤ 90 days = 0.6

∴ The probability that the LPG will last ≥ 60 days and ≤ 90 days will be = (Probability that a LPG will last ≤ 90 days ) – (Probability that a LPG will last < 60 days)

= 0.6 – 0.2 = 0.4

Hence, option (a).

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