ted is not particularly creative He uses the pickup line if

ted is not particularly creative. He uses the pickup line \"if I could rearrange the alphabet I\'d put u and i together\" the random variable x is the number of girls ted approaches before encountering one who reacts positively. determine whether the table describes a probability. if it does find the means and standard deviation.

x P(x)

1 0.001

2 0.031

3 0.136

4 0.243

5 0.312

Solution

If it did successfully describe a probability then the column P(x) would sum to 1.00 which represents 100% but the column sums up to ( 0.001 + 0.031 + 0.136 + 0.243 + 0.312) = 0.723 which is clearly not 1.00 so there are missing probabilities somewhere and this does not describe a probability successfully.