exam Maths Puzzle Numerical Ability

Answer the following using graphing method

x+3y=4
x=3

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exam Other Question

Solve for R1:

1/F = (n-1)(1/R1-1/R2)
A researcher randomly selects and interviews fifty male and fifty female teachers. What sampling technique is used?
a. cluster
b. stratified
c. random
d. systematic
e. convenience