The probability that in a household LPG will last 60 days or more is 0.8 and that it will last at most 90 days is 0.6. The probability that the LPG will last 60 to 90 days is
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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