Question

The probability of getting a defective bulb from a box containing 200 bulbs is 0.035 .The number of defective bulbs in the box are
( a) 7 ( b) 14 ( c ) 21 (d) 28​

Answer 1

Given,

Probability of defective bulb in box $\[ = 0.035\]$

Total bulb $\[ = 200\]$

Solution,

Consider the defective bulbs are x.

Probability of defective bulb in box,

= defective bulb in box / total box

$\[\begin{array}{l}\frac{x}{{200}} = 0.035\\ \Rightarrow x = 0.035 \times 200\\ \Rightarrow x = 7\end{array}\]$

Hence the number of defective bulbs are 7.

The correct option is (a), i.e. 7

Answer 2

Answer:

=>Probability of defective bulb in box = 0.035

Total bulb = 200

Solution,

Consider the defective bulbs are x.

Probability of defective bulb in box,

= defective bulb in box / total box

200 = 0.035 ⇒ x = 0.035 × 200 = 7 =

Hence the number of defective bulbs are 7.

The correct option is (a), i.e. 7