book Maths Puzzle Numerical Ability

Xa (insert operator here) Xb which operator cannot be true?

operator options: < > =

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book Other Question

The random variable x represents the number of boys in a family of three children. Asuming tha boys and girls are likely, find mean and standard deviation for the random variable x. I have a problem that has (1,5) and (2,7) i have to figure out what the equation is for the slope-intercept form.