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!
1 Some booster seats can be used for children up to 60 inches and 120 pounds. 2  Many state laws prefer that children 12 years and younger sit in the back seat if available. 3  Some states, as is the case in Michigan, forbid placing a child under the age of 4 years in a front seat if a rear seat is available. All children who are smaller than 150 cm (4 ft 11 in) and younger than 14 years old must use a booster or car seat appropriate to their weight. 2  A child must be either 14 years old or 4'11 to ride without a booster seat.