100% - 30% = 70%
70% = 0.7
6.30 / 0.7 = $9
answer: <span>original price of the books were $9</span>
Answer:
Z = -6.3
Step-by-step explanation:
Given that:
Since the alternative hypothesis is less than 0.28, then this is a left-tailed hypothesis.
Sample sixe n = 800
= 0.217
The standard error
Since this is a single proportional test, the test statistics can be computed as:
Z = -6.3
To do this, make the line the hypotenuse of a triangle. Then you can use a
²+b²=c² to find the length.
Answer:
the answer is 2,800
Step-by-step explanation: