4. A battery manufacturer tests the life of a sample of batteries by putting them into toys and timing them. The results she gets, in minutes, from 58 tests, are shown below. Time, (t), minutes 500

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4. A battery manufacturer tests the life of a sample of batteries by putting them into toys
and timing them. The results she gets, in minutes, from 58 tests, are shown below.
Time, (t),
600 < t < 700 700
500 <t < 600
<t< 750
750 < t< 900
900 <t< 1100
minutes
Frequency
4
10
10
18
16
a. Calculate an estimate for the mean life of these batteries.
b. Calculate an estimate for the standard deviation of the life of these batteries.
c. Why are your answers to parts a. and b. only estimates?
Transcribed Image Text:4. A battery manufacturer tests the life of a sample of batteries by putting them into toys and timing them. The results she gets, in minutes, from 58 tests, are shown below. Time, (t), 600 < t < 700 700 500 <t < 600 <t< 750 750 < t< 900 900 <t< 1100 minutes Frequency 4 10 10 18 16 a. Calculate an estimate for the mean life of these batteries. b. Calculate an estimate for the standard deviation of the life of these batteries. c. Why are your answers to parts a. and b. only estimates?
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