Question

Q.5) In a box there are 800 bulbs, out of which 20 bulbs are defective. Find
the probability that the bulb is not defective.​

Answer 1

Answer:

total number of balls = 800

defective balls = 20

not defective balls = 780

probability of not defective balls = 780/800

= 0.975

Answer 2

Answer:

$\fcolorbox{red}{yellow}{hi \: there} \\ total \: bulbs = 800 \\ defective \: bulbs = 20 \\ p(e) = \frac{no \: of \: outcome}{total \: no \: of \: outcomes}$

$good \: bulbs \: = 800 - 20 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: =780 \\ p(good \: bulbs) = \frac{no \: of \: good \: bulbs}{total \: no \: of \: bulbs} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{780}{800} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{39}{40}$

So, the probability of getting a good or not a defective bulb is 39 of 40 or 0.975.

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