Based upon extensive data from a national high school educational testing program, the standard deviation of national test scores for mathematics was found to be 118 points. If a sample of 324 students are given the test, what would be the standard error of the mean?

The standard error of the mean would be 6.5556.

Step-by-step explanation:

The standard error of the mean is given by the following formula:

In which n is the size of the sample and is the standard deviation of the population.

In this problem, we have that:

If a sample of 324 students are given the test, what would be the standard error of the mean?

The standard error of the mean would be 6.5556.

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.