Question

The following tensile strengths were measured for four specimens of the same steel alloy: Computation of average value $ar{x} = frac{sum_{i=1}^{n} x_i}{n}$ Computation of standard deviation $s = left[frac{sum_{i=1}^{n} (x_i - ar{x})^2}{n-1} ight]^{1/2}$ Sample Number Tensile Strength (MPa) 1 520 2 512 3 515 4 522 (a) Compute the average tensile strength. (b) Determine the standard deviation.

          The following tensile strengths were measured for
four specimens of the same steel alloy:
Computation of average value
$ar{x} = frac{sum_{i=1}^{n} x_i}{n}$
Computation of standard deviation
$s = left[frac{sum_{i=1}^{n} (x_i - ar{x})^2}{n-1}
ight]^{1/2}$
Sample Number Tensile Strength (MPa)
1 520
2 512
3 515
4 522
(a) Compute the average tensile strength.
(b) Determine the standard deviation.

$The following tensile strengths were measured for four specimens of the same steel alloy: Computation of average value arx = fracsumi=1^n xin Computation of standard deviation s = left[fracsumi=1^n (xi - arx)^2n-1 ight]^1/2 Sample Number Tensile Strength (MPa) 1 520 2 512 3 515 4 522 (a) Compute the average tensile strength. (b) Determine the standard deviation.$

Added by Daniel L.

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