For any population with mean Î¼and standard deviation.  The mean, or center of the sampling distribution of, is equal to the population mean Î¼:Î¼ x = Î¼.  The standard deviation of the sampling distribution is Ï/â n, where n is the sample size: Ï x = Ï / â n.
Usually a child should be 13 or older to ride in the front seat. If the child is too small then the front airbags can be dangerous and they may still need a booster seat. When â¦ they outgrow booster seats then they should be large enough to ride on the seat with just seatbelts. Always make sure they are buckled up!
Lawmakers have eliminated most of these gaps by amending their child safety seat and safety belt laws; still, 15-year-olds riding in the rear seat in Arkansas, Alabama and Ohio, and children age 9 or older who are not taller than 4 feet 9 inches riding in the rear seat in Oklahoma are covered by neither law.