The ph measurements of water specimens from various locations along a given river basin are normally distributed with standard deviation 0.3. the average ph of water specimens from 4 randomly selected locations on this river basin is 7.8

a) based on these data, a 95% confidence interval for mean has a margin of error of?

b) if instead of 4 water specimens we had measured the ph of 16 water specimen, the a margin error of a 95% confidence interval for mean would be?

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answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

34

step-by-step explanation:

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

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step-by-step explanation: