To solve this, we can use the z statistic. The formula for
z score is given as:
z = (x – u) / s
where x is the actual cost = 4000, u is the mean cost =
5000, and s is the standard deviation = 2000
Solving for z:
z = (4000 – 5000) / 2000
z = - 0.5
<span>Therefore the piano cost is only 0.5 standard deviations
below the average cost.</span>
0.25q + 0.1d = 4.95
d = 3q
0.25q + 0.1(3q) = 4.95
0.25q + 0.3q = 4.95
<u>0.55q</u> = <u>4.95</u>
0.55 0.55
q = 9
0.25(9) + 0.1d = 4.95
2.25 + 0.1d = 4.95
<u>- 2.25 - 2.25</u>
<u>0.1d</u> = <u>2.7</u>
0.1 0.1
d = 27
Answer:
Yes
Step-by-step explanation:
16.5-15.<3.8