Ski resorts are interested in the mean age that children take their first ski and snowboard lessons. they need this information to plan their ski classes optimally. define the following in terms of the study. give examples where appropriate.
a. the parameter is the average age of all people taking skiing or snowboarding lessons.
b. the parameter is the average age of all children taking skiing or snowboarding lessons on a given day.
c. the parameter is the ages of everyone at the ski resort.
d. the parameter is the average age of all children when they take their first skiing or snowboarding lesson.

Option D

Step-by-step explanation:

Given that Ski resorts are interested in the mean age that children take their first ski and snowboard lessons. They need this information to plan their ski classes optimally.

The population of interest here is the children when they take their first skiing or snowboarding lesson.  The average age of them would be a characteristic of a population.  Hence this is the parameter.

D. The parameter is the average age of all children when they take their first skiing or snowboarding lesson.

ratio is 2 : 9

the answer is three

13.5 : 3

the radius is 2 times the diameter.

step-by-step explanation: