Question 5 ii The following table gives the life times of neon lamps-begin array - c - c - WheLength in hours-Number of lampsillhline 300-40081411400-500 - 56 -500-600 - 60 1600-700 - 86 1700-80087741800-900862 900-1000 - 48 11 hlinelendarrayii How many lamps have a life time of more than 700 hours-

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Standard IX

Mathematics

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Question 5 ii...

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Question 5 (ii)
The following table gives the life times of neon lamps:
$\begin{matrix} L e n g t h (i n h o u r s) & N u m b e r o f l a m p s 300 - 400 & 14 400 - 500 & 56 500 - 600 & 60 600 - 700 & 86 700 - 800 & 74 800 - 900 & 62 900 - 1000 & 48 \end{matrix}$
(ii) How many lamps have a life time of more than 700 hours?

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Solution

(ii) It can be concluded that the number of neon lamps having their life time more than 700 is the sum of the number of neon lamps having their life time as 700−800, 800 − 900, and 900−1000.
Therefore, the number of neon lamps having their life time more than 700 hours is 184. (74 + 62+48 = 184)

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Q. Question 5 (i)
The following table gives the life times of neon lamps:

\begin{matrix} L e n g t h (i n h o u r s) & N u m b e r o f l a m p s 300 - 400 & 14 400 - 500 & 56 500 - 600 & 60 600 - 700 & 86 700 - 800 & 74 800 - 900 & 62 900 - 1000 & 48 \end{matrix}

(i) Represent the given information with the help of a histogram.

Question 5 (ii)
The following table gives the life times of neon lamps:
$\begin{matrix} Length (in hours) & Number of lamps 300 - 400 & 14 400 - 500 & 56 500 - 600 & 60 600 - 700 & 86 700 - 800 & 74 800 - 900 & 62 900 - 1000 & 48 \end{matrix}$
(ii) How many lamps have a life time of more than 700 hours?

Question 5 (ii)
The following table gives the life times of neon lamps:
$\begin{matrix} Length (in hours) & Number of lamps 300 - 400 & 14 400 - 500 & 56 500 - 600 & 60 600 - 700 & 86 700 - 800 & 74 800 - 900 & 62 900 - 1000 & 48 \end{matrix}$
(ii) How many lamps have a life time of more than 700 hours?

Q. The following table gives the life times of neon lamps:

\begin{matrix} Length (in hours) & Number of lamps 300 - 400 & 14 400 - 500 & 56 500 - 600 & 60 600 - 700 & 86 700 - 800 & 74 800 - 900 & 62 900 - 1000 & 48 \end{matrix}

(i) Represent the given information with the help of a histogram.
(ii) How many lamps have a life time of more than 700 hours?

The following table gives the life times of 400 neon lamps :

(i)

Represent the given information with the help of histogram.

Life time (in hours)	Number of lamps
$300 - 400$	$14$
$400 - 500$	$56$
$500 - 600$	$60$
$600 - 700$	$86$
$700 - 800$	$74$
$800 - 900$	$62$
$900 - 1000$	$48$

(i i)

How many lamps have a life time more than

700

hours?

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Question 5 (ii) The following table gives the life times of neon lamps: Length (in hours)Number of lamps300−40014400−50056500−60060600−70086700−80074800−90062900−100048 (ii) How many lamps have a life time of more than 700 hours?