So we would count this as "2 matches." Let's repeat this process a few more times.
(a) Take four index cards and one sheet of scratch paper. Write one of the babies' first names on each index card and divide the sheet into four regions, writing one of the mothers' last names in each region. Shuffle the four index cards well, and then deal them our randomly, placing one card on each region of the sheet. Finally, turn the cards over to reveal which babies were randomly assigned to which mothers. Record in your lab report how many of the mothers received their own baby. (Then remember to return to these online instructions for more information.)
(b) Repeat the random "dealing" of babies to mothers a total of ten times, recording in your lab report how many mothers received the correct baby in each trial.
|Number of matches|
(c) In your 10 trials, how many times did zero mothers receive her own baby?
(d) What proportion of times? (Divide your answer to c by 10. This is often called the relative frequency.)