It is everyone's responsibility to cherish energy and save electricity. In order to understand the situation of saving electricity in a residential area, the property management company randomly selected a certain day this year.
(1) In this set of data, the largest daily electricity consumption is 5.6, and the least is 3.4.
Range =5.6-3.4=2.2,
Average value = (4.4+4.0+5.0+5.6+3.4+4.8+3.4+5.2+4.0+4.2) ÷10 = 4.4;
(2) The average savings of this 10 household on this day: 7.8-4.4=3.4 degrees.
The total number is: 3.4×200=680 degrees.