exam Maths Puzzle Numerical Ability

8. How does the t distribution differ from the standard z distribution?
A) Continuous distribution
B) Bell-shaped
C) Family of distributions
D) Symmetrical
E) None of the above

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Can you please help me solve using the substitution method?

x + y = 1
x + y = 2 A gain dealer sold to one customer 8 bushels of wheat, 2 of corn, and 6 of rye, for $32.60; to another. 2 of wheat, 6 of corn, and 8 of rye, for $36.80; of and to a third, 6 of wh