12.3: 5 dollars
noah has $5.
a. elena has 40% as much as noah. how much does ele
w much does elena have?
b.
compare elena's and noah's money using fractions. di
illustrate.
ney using fractions. draw a diagram to
1
s
s
diego has 150% as much as noah. how much does diego have
d.
compare diego's and noah's money using fractions. draw a diagram
illustrate.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.