The type of sampling used here is Stratified random sampling. This is used so that no contestant knows when to prepare and to test if they are actually ready for the contest.
Answer:
$100 if I'm not mistaken
Step-by-step explanation:
125×0.8
(20 percent off)
Answer:
you should read and study more
Step-by-step explanation:
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Step-by-step explanation:
the question is z²=1
taking square root on both sides
√z² = √1
the square root and the square cancel out each other
it gives
z=±1
that means either z=+1 or z=-1
so the solutions are 1 and -1