Answer:
The test statistic is -2.
Step-by-step explanation:
Test statistic (z) = (sample sd - population sd) ÷ sample sd/√n
sample sd = 0.025 inches
population sd = 0.035 inches
n = 25
z = (0.025 - 0.035) ÷ 0.025/√25 = -0.01 ÷ 0.005 = -2
Answer:
$24.5
Step-by-step explanation:
Given that:
cost of 8 books = 19.60$
So the cost of one will be found by:
cost of 1 book = 19.60$/8
cost of 1 book = $2.45
Now finding cost of 10 books:
cost of 10 books = $2.45 *10
cost of 10 books = $24.5
i hope it will help you!
Answer:
Step-by-step explanation:
7 : 5 = 7x : 5x
7x + 5x = 12x
12x = 48 ⇒ x = 48:12 = 4
7x = 7 · 4 = 28
5x = 5 · 4 = 20
Answer: 28 : 20