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Rotation and Revolution of the Moon

What percenta...

Question

What percentage of sunlight does the surface of the Moon reflects?

A

Less than 10%

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B

50%

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C

70%

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D

More than 90%

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Solution

The correct option is A Less than 10%
Surface of the Moon reflects about 7% of the sunlight.

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more marks than Akbar. What percentage of marks does Akbar get less than Sunil?

Q. Compute the median for each of the following data:

(i)Marks	No. of students	(ii)Marks	No. of students
Less than $10$	$0$	More than $150$	$0$
Less than $30$	$10$	More than $140$	$12$
Less than $50$	$25$	More than $130$	$27$
Less than $70$	$43$	More than $120$	$60$
Less than $90$	$65$	More than $110$	$105$
Less than $110$	$87$	More than $100$	$124$
Less than $130$	$96$	More than $90$	$141$
Less than $150$	$100$	More than $80$	$150$

Following are the ages (in years) of 360 patients, getting medical treatment in a hospital:

Age (in years)	10 – 20	20 – 30	30 – 40	40 – 50	50 – 60	60 – 70
Number of patients	90	50	60	80	50	30

One of the patients is selected at random.
What is the probability that his age is
(i) 30 years or more but less than 40 years?
(ii) 50 years or more but less than 70 years?
(iii) 10 years or more but less than 40 years?
(iv) 10 years or more?
(v) less than 10 years?

Q. Following table shows marks (out of 100) of students in a class test:

\begin{matrix} Marks & No. of students More than or equal to 0 & 80 More than or equal to 10 & 77 More than or equal to 20 & 72 More than or equal to 30 & 65 More than or equal to 40 & 55 More than or equal to 50 & 43 More than or equal to 60 & 28 More than or equal to 70 & 16 More than or equal to 80 & 10 More than or equal to 90 & 8 More than or equal to 100 & 0 \end{matrix}

Draw a 'more than type' ogive. From the curve, find the median. Also, check the value of the median by actual calculation.

Q. Calculate arithemtic eman from the foolowing data:

Marks	No. Students
More than 0	150
More than 10	140
More than 20	100
More than 30	80
More than 40	80
More than 50	70
More than 60	30
More than 70	14

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