6. Given: Variance of X=30, Regression Equations: 3X+4Y=44 and 5X+8Y= 80. Find
a) Mean of X and Y
b) r (c) S.D of Y
7. A man having to drive 90 KM wishes to achieve an average speed of 30 KM per hour. For
the first half of the journey, he averages only 20 KM per hour. What must be his average
speed for the second half of the journey if his overall average speed is to be 30 KM per
hour?
8. On an examination in English, 10 students in one class showed a mean grade of 80 with
Standard Deviation of 8, while 12 students of another class showed mean grade of 76 with
standard deviation of 10. Assuming 0.01 level of significance determine whether the first
group is superior to second group
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