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The following...

Question

The following table gives the life times of $400$ neon lamps:
(i) Represent the given information with the help of a histogram.
(ii) How many lamps have a life time of more than $700$ hours?

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Solution

(ii) Lifetime of more than $700$ hours : $700 - 800, 800 - 900$ & $900 - 1000$
$∴$ Number of neon lamps $= 74 + 62 + 48 = 184$

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Similar questions

\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)

(i i)

700

The following table gives the life times of neon lamps:

Length (in hours)

Number of lamps

300 − 400

400 − 500

500 − 600

600 − 700

700 − 800

800 − 900

900 − 1000

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

(ii) How many lamps have a lifetime of more than 700 hours?

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

Lifetime (in hr)	300−400	400−500	500−600	600−700	700−800	800−900	900−1000
Number of lamps	14	56	60	86	74	62	48

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