Consider the set of ages of students shown below:

Ages (x)Frequency (f)

172

184

197

206

212

223

252

263

321

Total

3.Consider the frequency distribution of ages of the students in a mathematics class.

a. Find the mean ( x ). b. Find the median. c. Find the mode(s). d. Find the 5 number summary. e. A pair of identical twins joined the class. When their ages are added, the mean ages in the class is 21.16 years. How old are the twins?