# Kevlar epoxy is a material use

Kevlar epoxy is a material used on the NASA space shuttles. Strands of this epoxy were tested at the 90% breaking strength. The following data represent time to failure (in hours) for a random sample of 50 epoxy strands. Let x be a random variable representing time to failure (in hours) at 90% breaking strength.

 0.54 1.8 1.52 2.05 1.03 1.18 0.8 1.33 1.29 1.14 3.34 1.54 0.08 0.12 0.6 0.72 0.92 1.05 1.43 3.02 1.81 2.17 0.63 0.56 0.03 0.09 0.18 0.34 1.51 1.45 1.52 0.19 1.55 0.02 0.07 0.65 0.4 0.24 1.51 1.45 1.6 1.8 4.69 0.08 7.89 1.58 1.63 0.03 0.23 0.72

(a) Find the range.

(b) Use a calculator to calculate Σx and Σx2.

 Σx = Σx2 =

(c) Use the results of part (b) to compute the sample mean, variance, and standard deviation for the time to failure. (Round your answers to four decimal places.)

 x = s2 = s =

# Kevlar epoxy is a material use

Kevlar epoxy is a material used on the NASA space shuttles. Strands of this epoxy were tested at the 90% breaking strength. The following data represent time to failure (in hours) for a random sample of 50 epoxy strands. Let x be a random variable representing time to failure (in hours) at 90% breaking strength.
 0.55 1.8 1.52 2.05 1.03 1.18 0.8 1.33 1.29 1.14 3.34 1.54 0.08 0.12 0.6 0.72 0.92 1.05 1.43 3.01 1.81 2.17 0.63 0.56 0.03 0.09 0.18 0.34 1.51 1.45 1.52 0.19 1.55 0.02 0.07 0.65 0.4 0.24 1.51 1.45 1.6 1.8 4.69 0.08 7.89 1.58 1.62 0.03 0.23 0.72

(b) Use a calculator to calculate Σx and Σx2.

 Σx = Σx2 =

(c) Use the results of part (b) to compute the sample mean, variance, and standard deviation for the time to failure. (Round your answers to four decimal places.)

 x = s2 = s =

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