Question

A
box
contains
900
bolts
out
of
which
25
are
defective
.
One
bolt
is
taken
out
at
random
form
this
box
.
What
is
multiple of 3.
6. A card is drawn form a well-shuffled deck of 52 cards. Find the probability of getting :
(a) a black card
(b) a red card
(c) a diamond card
(d)
(e) a face card
(f) an ace of hearts
(8) a picture card
a black number card
the probability that it is an non-defective bolt?
An urn contains 3 red 5​

Answer 1

Answer:

A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb drawn in is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective ?

answer=i) P(Defective bulb)=

Total Bulbs

Defective Bulbs

=

20

4

=

5

1

ii) Since one bulb is already drawn, the number of bulbs remaining is 19.

Number of non defective bulbs is 15 as one bulb is picked.

P(Non-defective)=

19

15

.