In a box of 50 buttons there are three kinds -- wooden, plastic, and shell. You don't know how many of each kind. You reach into the box without looking and grab any button, put it back in the box, and mix them up. You try this over and over again. After 10 trials you find that you have picked a wooden button twice, a plastic button five times, and a shell button three times. Based on these experimental results, how many shell buttons can be estimated to be in the box.
20 shell buttons
10 shell buttons
15 shell buttons
30 shell buttons

would it be 15?

Question

In a box of 50 buttons there are three kinds -- wooden, plastic, and shell. You don't know how many of each kind. You reach into the box without looking and grab any button, put it back in the box, and mix them up. You try this over and over again. After 10 trials you find that you have picked a wooden button twice, a plastic button five times, and a shell button three times. Based on these experimental results, how many shell buttons can be estimated to be in the box.
20 shell buttons
10 shell buttons
15 shell buttons
30 shell buttons
 
would it be 15?

anonymous · Answer

yea. it should be. 15/50 is 3/10.

anonymous · Answer

thanks thought so