It is known that a box of 550 bulbs contains 22 defective bulbs. One bulb is taken out at random from the box. Find the probability of getting a good bulb?

$\frac{275}{264}$

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$\frac{274}{275}$

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$\frac{284}{275}$

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$\frac{264}{275}$

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Solution

The correct option is D
$\frac{264}{275}$

Probability = $\frac{N u m b e r o f f a v o u r a b l e o u t c o m e s}{T o t a l n u m b e r o f o u t c o m e s}$

Number of defective bulbs = 22

$∴$ No. of good bulbs = 550 – 22 = 528

P (good bulbs) = $\frac{528}{550}$ = $\frac{264}{275}$

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It is known that a box of 550 bulbs contains 22 defective bulbs. One bulb is taken out at random from the box. Find the probability of getting a good bulb?

The correct option is D 264275 Probability = Number of favourable outcomes Total number of outcomes Number of defective bulbs = 22 ∴ No. of good bulbs = 550 – 22 = 528 P (good bulbs) =528550 = 264275

The correct option is D
$\frac{264}{275}$

Probability = $\frac{N u m b e r o f f a v o u r a b l e o u t c o m e s}{T o t a l n u m b e r o f o u t c o m e s}$

Number of defective bulbs = 22

$∴$ No. of good bulbs = 550 – 22 = 528

P (good bulbs) = $\frac{528}{550}$ = $\frac{264}{275}$