Question

1.Find the Arithmetic mean of all the single digit even natural numbers.

2. In A ABC, D and E are points on AB and AC, so that AD AB !! A =. Represent this data diagrammatically

and label it ?

3. Explain the procedure to find median of ungrouped data 4. Write trigonometric identity in tan e and sec 0.

In the adjacent figure PQ II ZY, find the length of PZ.
PO 4 cm ,4.5 cm ,6 cm ,X

6. Does the mode change if another observation is added to the data ? Comment. 8, 6,4,5,0, a,1, 3,2,3.

7. If sin (A-B) = 2, cos (A + B) = }, 0°< A +B< 90°, A>B, then

find the value of 'A'.​

Answer 1

Answer:

1, the average of numbers be 6, we violate a+b>c+d. so there is at least one 8's is 1 or 2

EXPLINATION

NOW LISTING SHOULD BE STRAIGH FORWARD. DO (i) one 8 and (ii) two 8's

(i) there is only one 8, and the average is 6, so we must have one 8, two 6's and one 4. where can they be? because a+b> c+d, one of a or b must be 8, and the other 6. and therefore one of c or d is 6 and the other 4. list all cases, you should get 4.

Answer 2

Answer:

1

solution

x : 2 4 6 8

mean = 2+4+6+8 / 4 = 20/4 = 5