50 students enter for a school javeloin throw competition. The distance (in metre) thrown are recorded below

(i) Construct a cumulative frequency table.
(ii)Calculate the median distance by using the formula for median.

The annual rainfall record of a city for 66 days is given below in the table : Calculate the median rainfall ,using the formula .

The construction of cummulative frequency table is useful in determining the (i)Mean (ii)Median (iii)Mode (iv)All of the above

a) A small object is placed 150 mm away from a diverging lens of focal length 100 mm. i) Copy the figure below and draw rays to show how an image is formed by the lens. ii) Calculate the distance of the image from the lens by using the lens formula. b) The diverging lens in part a) is replaced by a converging lens also of focal length 100 nm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverring lens in part a)

The following frequency distribution table shows the distances travelled by some rickshaws in a day. Observe the table and answer the following question: (a) which is the modal class? Why? (b) which is the median class and why? (c) write the cumulative frequency (c.f.) of the class preceding the median class. (d) what is the class interval (h) to calculate median?

During the medical check-up of 35 students of a class, their weights were recorded as follows: Draw a less than type ogive for the given data. Hence obtain the median weight from the graph and verify the result by using the formula. weight (in kg)=38-40 40-42 42-44 44-46 46-48 48-50 50-52 No. of students=3 2 4 5 14 4 3

An incomplete distribution is given below: The value of the median is 46 and the total number of items is 230. (i) Using the median formula fill up the missing frequencies. (ii) Calculate A.M. of the completed distribution.

The histogram below represents the scores obtained by 25 students in a Mathematics mental test. Use the data to, (i) Frame a frequency distribution table (ii) To calculate mean

Passage-II: Consider a block conducting material of resistivity . rho . shown in the figure. Current .I. enters at .A. and leaves from .D.. We apply superposition principle to find voltage . DeltaV . developed between .B. and .C.. The calculation is done in the following steps : i) Take current .I. entering from .A. and assume it to spread over a hemispherical surface in the block. ii) Calculate field E(r ) at distance .r. from A by using Ohm.s law E= rhoj , where j is the current per unit area at .r.. iii) From the .r. dependence of E(r ), obtain the potential V(r ) at r. iv) Repeat (i), (ii), (iii) for current .I. leaving .D. and superpose results for .A. and .D.. For current entering at A the electric field at a distance .r. from A is

Consider a block of conducting material of resistivity 'rho' shown in the figure. Current 'I' enters at 'A' and leaves from 'D'. We apply superposition principle to find voltage DeltaV developed between 'B' and 'C'. The calculation is done in the following steps: (i) Take current 'I' entering from 'A' and assume it to spread over a hemispherical surface in the block. (ii) Calculate field E(r) at distance 'r' from A by using Ohm's law E = rhoj, where j is the current per unit area at 'r'. (iii) From the 'r' dependence of E(r), obtain the potential V(r) at r. (iv) Repeat (i), (ii) and (iii) for current 'I' leaving 'D' and superpose results for 'A' and 'D'. For current entering at A, the electric field at a distance 'r'