1
(b)
An electronics company, Sparks Inc., are getting feedback from customers
that the battery life of their tablet varies from the advertised 10 hours.
(a)
The electronics company test 7 batteries at random and record
the time it takes them to run from 100% to 0%. The results,
in hours, are as follows:
(0)
8-4,
8-6, 9-2, 10-3, 8-9, 9-7, 9-3
Find the mean of these battery lives.
9 3 * =
8₁4 + 8₁6 +
6.4.4
92 +
(ii) Find the range of these battery lives.
10,3 +
8.9497
4
64,4:7=9_?
The researchers tested one more battery and the mean value increased to 9-25 hours.
Find the time it takes for this battery to run from 100% to 0%.
I w
sp
puny
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