Decide whether a discrete or continuous random variable is thebest model for eac

Question

Decide whether a discrete or continuous random variable is thebest model for each of the following variables:
a. The time until a projectile returns to earth
b. The number of times a transistor in a computer memorychanges state in one operation
c. The volume of gasoline that is lost to evaporation duringthe filling of a gas tank
d. The outside diameter of a machined shaft
e. The number of cracks exceeding one-half inch in 10 miles ofa interstate highway
f. The weight of an injection-molded plastic part
g. The number of molecules in a sample of gas
h. The concentration of output from a reactor
i. The current in an electronic circuit

Explanation / Answer

a. The time until a projectile returns to earth Ans-CONTINUOUS RANDOM VARIABLE b. The number of times a transistor in a computer memorychanges state in one operation ans: DISCRETE RANDOM VARIABLE c. The volume of gasoline that is lost to evaporation duringthe filling of a gas tank ans: CONTINUOUS RANDOM VARIABLE d. The outside diameter of a machined shaft ans: CONTINUOUS RANDOM VARIABLE e. The number of cracks exceeding one-half inch in 10 miles ofa interstate highway ans: DISCRETE RANDOM VARIABLE f. The weight of an injection-molded plastic part ans: CONTINUOUS RANDOM VARIABLE g. The number of molecules in a sample of gas ans: DISCRETE RANDOM VARIABLE h. The concentration of output from a reactor ans: CONTINUOUS RANDOM VARIABLE i. The current in an electronic circuit ans: CONTINUOUS RANDOM VARIABLE

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