Question

1.

An electronics store has received a shipment of 20 table radios that have connections for an iPod

or iPhone. Twelve of these have two slots (so they can accommodate both devices), and the other

eight have a single slot. Suppose that six of the 20 radios are randomly selected to be stored

under a shelf where the radios are displayed, and the remaining ones are placed in a storeroom.

Let among the radios stored under the display shelf that have two slots.

a) Give the PMF of the number of radios stored under the display shelf have two slots.

b) Calculate the mean value and standard deviation of the number of radios stored under the

display shelf have two slots.

c) Compute the probability that at least four radios stored under the display shelf have two slots.

Answer 1

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