Final answer:
The stem-and-leaf plot shows that there are 12 values between 10 and 19, 13 values between 30 and 39, and 7 values between 40 and 49.
Step-by-step explanation:
The stem-and-leaf plot provided in your question allows us to analyze the distribution of the data set:
a. Values that are greater than or equal to 10 and less than or equal to 19 correspond to the stem of 1, with leaves (0 0 2 4 4 4 7 8 8 8 8 9). There are 12 such values.
b. Values that are greater than or equal to 30 and less than or equal to 39 correspond to the stem of 3, with leaves (3 4 4 5 5 5 6 6 6 7 9 9). There are 13 such values.
c. Values that are greater than or equal to 40 and less than or equal to 49 correspond to the stem of 4, with leaves (3 3 3 5 5 7 9). There are 7 such values.
Therefore, the answers are:
a. There are 12 values in the data set which are greater than or equal to 10 and less than or equal to 19.
b. There are 13 values in the data set which are greater than or equal to 30 and less than or equal to 39.
c. There are 7 values in the data set which are greater than or equal to 40 and less than or equal to 49.