Most water treatment facilities monitor the quality of their drinking water on hourly basis. One variable monitored it is pH, which measures the degree of alkalinity or acidity in the water. A pH below 7.0 is acidic, one above 7.0 is alkaline, and a pH of 7.0 is neutral.
One water treatment plant has a target pH of 8.5 (most try to maintain a slightly alkaline level).
The mean and standard deviation of 1 hour’s test results, based on 12 water samples at this plant are:

Mean =8.24 S=.16

Does this sample provide sufficient evidence that the mean pH level in the water differs from 8.5?

36

step-by-step explanation:

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

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.

2 over 5 and 4 over 15

don’t know last one sorry

step-by-step explanation: