Q1- Suppose
X is a random variable of normal distribution with mean 15.0 and
standard deviation 1.25. Compute the following probabilities using Table A.3.
a. P(X ≤15)
b. P(X≥10 )
c. P(14 ≤X ≤18)
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Q2- 2.
A leakage test was conducted to determine the effectiveness of a seal
designed to keep
the inside of a plug airtight. An air needle was inserted into the plug and this was placed
under water. The pressure was then increased until leakage was observed. The
magnitude of this pressure was recorded for 10 trials in psi:
3.1
3.5
3.3
3.7
4.5
4.2
2.8
3.9
3.5
3.3
a) Find sample mean and median
b) Find range and mean deviation
c) Find variance and standard deviation
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