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  1.  ∆ ABC is an isosceles triangle right angled at ‘C’ and AB ² = n.AC ² then, n = ............ 2.Prove that the sum of the squares of the sides of a rhombus is equal to the sum of the squares of its diagonals.  3. Write the statement of converse of Basic Proportionality theorem. 4.Draw a triangle ABC in which AB=5 cm, BC=6 cm and Ð ABC= 60 ° . Construct another triangle similar to ∆ ABC   with scale factor 5/ 7 .

For Un-grouped Data Note: Mean of first n natural numbers is (n+1)/2 Practice Questions 1. Find the arithmetic mean of the data 5, 6, 9, 10, 6, 6, 7. 2.The mean of 30 numbers is 150. It was detected on rechecking that one value of 165 was wrongly copied as 135. Find the correct mean?   [151]  3.Ʃx = 100, n = 10 then find the mean of the data.[10] 4.Mean of a given data is 10.   5 is added to each of the observation.      I. Mean do no change.      II. New Mean is  15.        Which of the statement is TRUE? Support your answer. 5.Find the mean of first 'n' natural numbers. 6.Find the average of the following set of scores 567, 434,323,290,401. [ JNV 2017 ]  7.Find the average of the following numbers. 06,0,12,14,13        [ JNV 2012 ] 8.The average of the height of 5 students having height 30,40,50,60,70 is      [ JNV 201 1] 9.Find the average...