question_answer

  The weight of coffee in 70 packets are shown in the following table

Weight (in mg)	200-201	201-202	202-203	203-204	204-205	205-206
Number of packets (f)	12	26	20	9	2	1

Determine the modal weight. OR Find the missing frequency f, if the mode of the given data is 154.

Class interval	120-130	130-140	140-150	150-160	160-170	170-180
Frequency	2	8	12	F	8	7

Answer:

  We have,

Weight (in mg)	Number of packets (f)
200-201 201-202 202-203 203-204 204-205 205-206	12 26 20 9 2 1

Mode                          (1) Here highest frequency is 26, so the modal class is 201-202. Mode                                       OR                                 (1) We have,

Class interval	(f)
120-130 130-140 140-150 150-160 160-170 170-180	2 8 12 f 8 7

                                    (1/2) Given, Mode Modal class is                          (1/2) Mode Here,and   (1)                                                                                                        (1)