What happens to the mean of the data set {10, 2, 8, 9, 5, 2, 6} if the number 12 is added to the data set?

Step-by-step explanation:

10+2+8+9+2+6+12/7

=49/7

= 7

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.