Answer:
1) 65%
2)-44%
Step-by-step explanation:
Formula:
((new value - old value)/(old value) )*100
If positive, it's an increase
if Negative, it's a decrease.
Answer:
y < -5
Step-by-step explanation:
-4(y+1) > 16
y+1 < -4
y < -5
English translation:
If the quality control manager wants to estimate the average life of lamps with 20 hours, with a confidence level of 95% and an error of 10% is assumed. What is the sample size?
The correct answer is Choice B: 0.3098.
To find the answer, you have to use a normal distribution table. Look up the percents for each z-score and subtract them to find the region between.
z = 1.92 the percent is 0.9726
z = 0.42 the percent is 0.6628
0.9726 - 0.6628 = 0.3098
