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)3005007009001100Frequency1012232510One bulb is selected at random from the lot. What is the probability that the selected bulb has a life more than 500 hours?a) 2740b) 2940c) 516d) 1
Answer» $80$ bulbs are selected at random from a lot and their lifetime in hours is recorded as under. $\begin{matrix} Lifetime (in hours) & 300 & 500 & 700 & 900 & 1100 Frequency & 10 & 12 & 23 & 25 & 10 \end{matrix}$ One bulb is selected at random from the lot. What is the probability that the selected bulb has a life more than $500$ hours? a) $\frac{27}{40}$ b) $\frac{29}{40}$ c) $\frac{51}{6}$ d) $1$

80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under.Lifetime (in hours)3005007009001100Frequency1012232510One bulb is selected at random from the lot. What is the probability that the selected bulb has a life more than 500 hours?a) 2740b) 2940c) 516d) 1

Answer»

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

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

One bulb is selected at random from the lot. What is the probability that the selected bulb has a life more than $500$ hours?

a) $\frac{27}{40}$

b) $\frac{29}{40}$

c) $\frac{51}{6}$

d) $1$

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80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under.Lifetime (in hours)3005007009001100Frequency1012232510One bulb is selected at random from the lot. What is the probability that the selected bulb has a life more than 500 hours?a) 2740b) 2940c) 516d) 1

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