4. A lawn service wants to find out how satisfied its customers are with its lawn services and pricing.
Sample X: the ten customers who spent the most money with the lawn
service over the past year.
Sample Y: ten customers who only used the lawn service one time over
the past year
Sample Z: ten customers who used the lawn service at any time during
the past year

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Which number line correctly shows 0.8 + 0.3?