exam Maths Puzzle Numerical Ability

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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exam Other Question

Polynomial ax^3+ bx^2+cx+d has integral coefficients a,b,c,d. ad is odd and bc is even.
PROVE THAT at least 1 root of the polynomial is irrational

I used sum of roots and produ Find the equation of each line. Write the answer in slope-intercept form.

The line is parallel to -3x + 2y = 9 and contains the point (-2,1).