Using the same cure it is known that a standard deviation is 130 kg/cm² and we may assume normal distribution. 100 pieces of cement have been tested and the
observed sample mean is X = 4970. Find the 95% confidence interval for the
mean.
(A) (4858.37, 5081.63)
(C) (4883.33, 5056.67)
(B) (4885.07, 5054.93)
(D) (4944.00, 4996.00)

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3