80 bulbs are selected at random from a lot and their lifetime in hours

1.	80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under. Lifetime (in hours)3005007009001100Frequency1012232510 Our bulb is selected at random from the lot. What is the probability that its life is 1150 hours? (a) 180 (b) 716 (c) 1 (d) 0
Answer» 80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under. $\begin{matrix} Lifetime (in hours) & 300 & 500 & 700 & 900 & 1100 Frequency & 10 & 12 & 23 & 25 & 10 \end{matrix}$ Our bulb is selected at random from the lot. What is the probability that its life is 1150 hours? (a) $\frac{1}{80}$ (b) $\frac{7}{16}$ (c) 1 (d) 0

80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under. Lifetime (in hours)3005007009001100Frequency1012232510 Our bulb is selected at random from the lot. What is the probability that its life is 1150 hours? (a) 180 (b) 716 (c) 1 (d) 0

Answer»

80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under.

$\begin{matrix} Lifetime (in hours) & 300 & 500 & 700 & 900 & 1100 Frequency & 10 & 12 & 23 & 25 & 10 \end{matrix}$

Our bulb is selected at random from the lot. What is the probability that its life is 1150 hours?

(a) $\frac{1}{80}$

(b) $\frac{7}{16}$

(d) 0