The probability that an electric bulb will last $150$ days or more is $0.7$ and that it will last at most $160$ days is $0.8$ . The probability that the bulb will last $150$ to $160$ days is

0.5

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0.56

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None of these

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Solution

The correct option is A $0.5$
$P (X \geq 150) = 0.7, P (X \leq 160) = 0.8$
$P (150 \leq X \leq 160) = 0.7 + 0.8 - 1 = 0.5$ .

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The probability that an electric bulb will last 150 days or more is 0.7 and that it will last at most 160 days is 0.8. The probability that the bulb will last 150 to 160 days is

The correct option is A 0.5P(X≥150)=0.7,P(X≤160)=0.8P(150≤X≤160)=0.7+0.8−1=0.5.

The probability that an electric bulb will last $150$ days or more is $0.7$ and that it will last at most $160$ days is $0.8$ . The probability that the bulb will last $150$ to $160$ days is

The correct option is A $0.5$
$P (X \geq 150) = 0.7, P (X \leq 160) = 0.8$
$P (150 \leq X \leq 160) = 0.7 + 0.8 - 1 = 0.5$ .