Answer:
about 68% of brand x’s batteries have a lifespan between 95.2 hours and 108.8 hours. about 68% of brand y’s batteries have a lifespan between 98.6 hours and 101.4 hours. the life span of brand y’s battery is more likely to be consistently close to the mean.
Explanation:
According to the empirical rule (68–95–99.7 rule) for a normal distribution, 68% of the data falls within the first standard deviation (μ ± σ).
Given for brand x, mean (μ) = 102 hours and standard deviation (σ) = 6.8 hours.
first standard deviation (μ ± σ) = 102 ± 6.8 = (95.2, 108.8)
about 68% of brand x’s batteries have a lifespan between 95.2 hours and 108.8 hours.
Given for brand y, mean (μ) = 100 hours and standard deviation (σ) = 1.4 hours.
first standard deviation (μ ± σ) = 100 ± 1.4 = (98.6, 101.4)
about 68% of brand x’s batteries have a lifespan between 98.6 hours and 101.4 hours.
Since the standard deviation of brand y is smaller than that of brand x, brand y battery is more likely to be consistently close to the mean
Answer:
Explanation:
Gross income = 1070
net income = gross income - tax = 1070 - 210 = 860
payment to credit card = 128
debt payment to income ratio without college loan
= 128 / 860
= .1488
Answer: A.There is sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,500
Explanation:
From the question, we are informed that according to the Federal Housing Finance Board, the mean price of a single-family home two years ago was $299,500 and that a real estate broker believes that due to recent credit crunch, the mean price has increased since then and the result is that the null hypothesis is not rejected.
The conclusion based on the results of the test is that since the null hypothesis has been rejected, it simply means that there are sufficient evidence that there has been an increase in the mean price since two years ago.
Therefore, option A is the correct answer.
Answer:
c
Explanation:
nate should have chosen to ask the supplier for verification for the requisition order