One bulb is selected at random from the lot. The probability that its life is 1150 hours, is

\frac{1}{80}

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\frac{7}{16}

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0

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Solution

The correct option is C $0$
$∵ n o o f b u l b s h a v i n g l i f e a b o v e 1100 h r s = 0 ∴ p (l i f e = 1150) = 0$

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Question 29
80 bulbs are selected at random from a lot and their life time ( in hours) is recorded in the form of a frequency table given below:

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

One bulb is selected at random from the lot. The probability that its life is 1150 h, is:

A) $\frac{1}{80}$
B) $\frac{7}{16}$
C) 0
D) 1

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

Q. Fill In The Blanks

80 bulbs are selected at random from a lot and their life time (in hrs) is recorded in the form of following frequency table:

Life time (in hrs): 300 500 700 900 1000
Frequency : 10 12 23 25 10

One bulb is selected at random from the lot. The probability that its life is 1150 hours is __________.

Q. 80 bulbs are selected at random from a lot and their lifetime (in hours) is recorded in the form of a frequency table given below:

\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. The probability that its lifetime is 1150 hours is:

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

Lifetime (in hours)	300	500	700	900	1100
Frequency	10	12	23	25	10

One bulb is selected at random from the lot. What is the probability that its life is 1150?
(a)

\frac{1}{80}

(b)

\frac{7}{16}

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One bulb is selected at random from the lot. The probability that its life is 1150 hours, is

The correct option is C 0∵noofbulbshavinglifeabove1100hrs=0∴p(life=1150)=0

The correct option is C $0$
$∵ n o o f b u l b s h a v i n g l i f e a b o v e 1100 h r s = 0 ∴ p (l i f e = 1150) = 0$