What is the most number of hours spent studying? How many students spent exactly 40 hours studying in a week?

Count the number of times '1' appears in the given data set for siblings:
1 2 2 3 3
0 1 2 0 1
2 2 3 1 1
2 2 3 0 1
There are 5 instances of '1'.

• 5

Count the number of times '0' appears in the given data set for siblings (representing an only child):
1 2 2 3 3
0 1 2 0 1
2 2 3 1 1
2 2 3 0 1
There are 3 instances of '0'.

• 3

To find the most number of hours spent studying, look at the largest stem and the largest leaf associated with it.
The largest stem is 5. The leaves for stem 5 are 1, 3, 5.
The largest value formed is 55 hours.

• 55 hours

To find how many students spent exactly 40 hours studying, look at the stem '4' and count the number of '0's in its leaf.
Stem 4 has leaves 0, 0, 0, 2, 5, 6, 8, 8.
There are three '0's in the leaf for stem 4, meaning three students spent 40 hours.

• 3