Consider the grouped frequency distribution below, in which the times (in minutes) it takes 40 students to complete an examination. Class (min) 70 < 90 90 110 K 110 < 130 130 < 150 150 < 170 Freq, f Midpoint, 4 9 13 O 5 40 A. 110 130 B. 130 150 OC. 70 < 90 D. 90 m 80 110 100 120 V 160 fm 320 W 1560 1260 Which class contains the lower quartile? 800 Zfm fm 25600 90000 H Cum. Freq 4 13 26 176400 J Zfm 128000 40 1