exam Maths Puzzle Numerical Ability

A sample of 26 is selected from the population. What is the number of degrees of freedom used to determine the appropriate critical t-value?
A) 20
B) 19
C) 24
D) 25
E) None of the above

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exam Other Question

x -a=-x+a+4b

1 s + 7 = 4 s
3 9 3

7 = -14
12

9- 2m =19
7 A can do a piece of work in 25 days and B can do a work in 20 days.both work together for 5days after that a leaves. how long will B need to finish the remaining work.