Question

1) Following are the weights ( in kg ) of 8 students of a class 48.5, 50, 44.5, 49.5, 50.5, 45, 51, 43
a) Find the mean weight. b) What will be the mean weight if a student, whose weight is 62kg, is also included?

2) Find the arithmetic mean of the scores 8, 6, 10, 12, 1, 3, 4, 4. Find the range of the data.

3) Find the mean of the 1st three composite numbers.

4) The heights of 10 girls were measured in cm and the results were as follows. 143, 148, 135, 150, 128, 139, 149, 146, 151, 132
a) What is the height of the tallest girl?
b) What is the height of the shortest girl?
c) What is the range of the data?
d) Find the mean height ?
e) Find the number of girls whose heights are less than the mean height ?

5) Find the mean of the 1st ten natural numbers.

6) Find the mode, mean and median of the scores 4, 5, 6, 7,7, 8, 9, 13, 12, 8, 8, 9, 8, 10, 11

7 ) A bag contains 3 red and 2 blue marbles. A marble is drawn at random. What is the probability of drawing a blue marble.

8) A box of 600 electric bulbs contains 12 defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non defective bulb ?

9) What is the probability of getting (i) an even number (ii) a multiple of 3 (iii) a number 3 or 4 (iv) an odd number (v) a number between 3 and 6


SIMPLE EQUATIONS
I. SOLVE
(i) 7y + 5 = 19 (ii) 3k + 9 = 5
(iii)a + 5 = 11 (iv)12a + 4 = 40
(v) 2x = 11 ( x = 22 ) 4 (vi)3m = 9
(vii) 2a – 4 = 6 (viii) 4 (x + 3 ) = 20
(ix)8x - 5 = 2 + 19 (x) 2m + 6 = 10
(xi)3 ( 2x - 1 ) + 5 = 14 (xii) 2z – ( 7 – 5z ) – 21 = 0
(xiii) 8x + 4 = 12 (xiv) 3 ( y – 1 ) = 2 ( 2y – 6 )

II. Set up equations and solve.

(i) Add 7 to 3times a number, you get 34. Find the number.

(ii) Subtract 23 from thrice a number the result is 7.find the number.

(iii)Anmol’s mother is 4 years more than 3times Anmol’s age. Find Anmol’s age if mother is 40 years old.

(iv)Tony scored twice as many runs as Kohli. Together they scored 6 short of triple century. How many runs did each score?

(v) The three angles of a triangle are in the ratio 2:3:5. Find the measure of each angle. Classify the triangle ( 36, 54, 90 ) .​

Answer 1

Answer:

Present age = 'k' years

After 2 years =′k+2′ years

7 years ago =′k−7′ years.

Answer 2

following are the weight( inkg) of 8student of a class

48.5,50,44.5,49.5,50.5,45,51,43