Question

Determine nature of roots of the quadratic equation.
m + 2m +9=0
solution: compare m? + 2m +9 =0 with ar? + bx+C =0
a = 1, b = 2, C=9
- 4ac = 22.4xxD
D=4-0
D=-32
--B2 - 4acco
..The roots of the equation are​

Answer 1

Answer:

Find the mean by converting the above table in the form of frequency distribution table by

taking the class intervals of wheat as 14-15, 15-16,...and so on.distribution table for the given set of scores:

39,16,30,37,53,15,16,60,58,26,28,19,20,12,14,24, 59,21,57,38,25,36,24,15,25,41,52,45,60,63,18,26,43,36,18,27,59,63,46,25,33,46,42,48,35,64,24.Take class intervals as (10−20),(20−30),.... and answer the following:

(i) What does the frequency corresponding to the third class interval mean?

(ii) What is the size of each class interval? Find the midpoint of the class interval 30−40.