The probability density function for the number of cartridges used in a printer over the life of the printer is given below

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The probability density function for the number of cartridges used in a printer over the life of the printer is given below.

x              5              6              7              8              9

f(x)         0.04        0.19        0.61        0.13        0.03

a) What is the expected number of cartridges used?

b) What is the probability that more than six cartridges are used?

c) What is the probability that out of ten randomly selected printers, eight or more use more than six cartridges over their lifetime?

    • 9 years ago
    The probability density function for the number of cartridges used in a printer over the life of the printer is given below. x 5 6 7 8 9 f(x) 0.04 0.19 0.61 0.13 0.03 a) What is the expected number of cartridges used? b) What is the probability that more
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