Based on the model N(1159,88) describing steer weights, what are the cutoff values for a) the highest 10% of the weights?
b) the lowest 20% of the weights?
c) the middle 40% of the weights?
a) The cutoff weight for the highest 10% of the steer weights is
pounds.

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.