3.7 Three companies supply the domestic electricity supply market in a particular region; Iskra, Moogom, and Provod.

Each company has produced an analysis of the distribution of the size of its customers’ bills over the last financial year.

The following results have been published:

Are the following statements true or false?

(a) Provod bills are on average the smallest and vary more than those from the other companies.

(b) Moogom bills are on average the largest and vary more than those from the other companies.

(c) Iskra bills are on average larger than those from Provod and vary more than those from Moogom.

(d) Iskra bills are on average smaller than those from Moogom and vary less than those from Provod.

(e) Moogom bills are on average larger than those from Iskra and vary more than those from Provod.

(f) Provod bills vary less than those from Iskra and are on average smaller than those from Moogom.

Transcribed Image Text:

Company Mean bill size Standard deviation of bill sizes Iskra 359 72 Moogom 412 47 Provod 307 61