Karri tests the charges of a random sample of 64 batteries from a large production run. The mean charge was 8.93 volts, and the process typically has a standard deviation of 0.2 volts. To see if the batch has a significantly different mean voltage from 9 volts, the value of the z-test statistic would be .

The Z-statistic value is

                  Z = -2.33

Step-by-step explanation:

Step(i):-

Random sample size     'n' = 64

mean of the sample  'x⁻ ' = 8.93 volts

standard deviation of the sample  = 0.2 volts

mean of the Population"μ" = 9 volts

Step(ii):-

Z -statistic

Conclusion:-

The Z-statistic value is  = -2.33

1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.

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step-by-step explanation: