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An electronics company, Sparks Inc., are getting feedback from customers t
that the battery life of their tablet varies from the advertised 10 hours. llabom
(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:
8-4, 8-6, 9-2, 10-3, 8-9, 9-7, 9.3
(i) Find the mean of these battery lives.
An electronics company, Sparks Inc., are getting feedback from customers t
that the battery life of their tablet varies from the advertised 10 hours. llabom
(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:
8-4, 8-6, 9-2, 10-3, 8-9, 9-7, 9.3
(i) Find the mean of these battery lives.
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Ответ:
9,2
Пошаговое объяснение:
Чтобы найти среднее время жизни батареи, нам нужно сложить все значения и разделить на общее количество протестированных батарей (в данном случае 7):
8,4 + 8,6 + 9,2 + 10,3 + 8,9 + 9,7 + 9,3 = 64,4
Среднее значение = сумма сроков службы батарей / количество протестированных батарей = 64,4 / 7 = 9,2.