Suppose x has a distribution with a mean of 70 and a standard deviation of 52. random samples of size n = 64 are drawn.
(a) describe the x distribution and compute the mean and standard deviation of the distribution.
(b) find the z value corresponding to x=87.
(c) p(x < 87).

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

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step-by-step explanati∵∵∴∴on:

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step-by-step explanation: