2.

                                        
 
a)    50% · 14 =  7         (median)
      7 values up from the bottom places it in the interval   63 - 66

b)  75% · 14 = 10.5      (third quartile -upper)
     10.5 values up from the bottom places it in the interval 67 - 70

c)  5 feet  =  60 inches                                              n% (14) =  9
     5 ft 7 in    =    67 inches                                              14      14
     9 students are shorter than 67 in                            n%   =  .642857143
                                                                                    n   ~     64%

64% of the students are shorter than 5 feet 7 in.      J