30.

31.

32.

33.

34.

4

Find the harmonic mean from the following data :
Size : 6 10 14 18

5 respectively }, |
Frequency : 20 40 30 10 ut as 40 and 7

. worked our | Iculate the corre, |
The mean and standard deviation of 100 observations ve one observation. Reca ॥
२ Computer who by mistake took value 50 in place of 40 fs
mean and standard deviation.

ining
५ course of tral
The ranking of 10 individuals at the start and at the finish of @

are as follows. F

J
௪ H 1
Individuals தை A B 0 D ந. ந ே 0 2
Rank before; 1 6 3 9 5 2 7 10 0 ‘
Rankafter : 6 8 8 2 7 10 5 9

Calculate Spe ’s rank ti fficient.
pearman’s rank correlation coefficien (6 x 5 = 30 marks)
Section D (Essay Type)

Answer any two questions,
Each question carries 12 marks.

Solve the following system of equations

4-9 + :10 + 8 : 7 - 32 + بز7 + :23 : 4 - 2 - بز9 + ند

0 1 2
If A=|2 -3 0 |, show that கரக்க ಸ _121ಎಂ.
1 1 -1

Explain mean, median and mode.

From the following data, obtain the two regression eq

uations -
Sales : 91 97 108 121 67 194 51 73 i
Purchase : 71 75 69 97 70 91 39 6 11 57
(४ » 12 =