Ex 1 Height of 2 vears old and 20 vears old Height of2yeas3930323435363630 old (inch) height of207163636768687064 years o (inch)12 Ex.1 Height of 2 years old and 20 years old Height of 2 years old （inch） 39 30 32 34 35 36 36 30 height of 20 years old （inch） 71 63 63 67 68 68 70 64