Question: The next 2 questions refer to the following information: The variable "num.of.doors" in the data set "cars" counts the number of cars in the sample that have four doors and the number that have two doors. In the given data set the number of cars with four doors is 114 and the number of cars with two doors is 89. Two observations have a missing value for this variable. Denote by p the probability that a car has four doors.

The estimated value of p, ignoring missing values, is:

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