caplode7497
15.05.2021 •
Mathematics
The fracture strength of tempered glass averages 13.7 (measured in thousands of pounds per square inch) and has standard deviation 2. (a) What is the probability that the average fracture strength of 100 randomly selected pieces of this glass exceeds 13.9
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Ответ:
0.15866
Step-by-step explanation:
Given :
μ = 13.7
x = 13.9
Sample size, n = 100
Standard deviation, σ = 2
Recall:
Z = (x - μ) ÷ σ/√n
Z = (13.9 - 13.7) ÷ 2/√100
Z = 0.2 ÷ 0.2
Z = 1
P(x > 13.9) = p(Z > 1) = 0.15866
Ответ:
X=3
Step-by-step explanation:
3 times 2 is 6.