Answer:
Step-by-step explanation:
We want to determine a 95% confidence interval for the population mean for the prices of slice toasters.
Number of sample, n = 12
Mean, u = $61.12
Standard deviation, s = $24.62
For a confidence level of 95%, the corresponding z value is 1.96.
We will apply the formula
Confidence interval
= mean ± z ×standard deviation/√n
It becomes
61.12 ± 1.96 × 24.62/√12
= 61.12 ± 1.96 × 7.107
= 61.12 ± 13.93
The lower end of the confidence interval is 61.12 - 13.93 =47.19
The upper end of the confidence interval is 61.12 + 13.93 = 75.05
Answer: the mean price and the median price are close together
Step-by-step explanation:
I just got this question and I got it right
Answer:
7 to the sixteenth power
Step-by-step explanation:
When multiplying these two powers of the base 7 together, we add the exponents:
7^12 * 7^4 = 7^16
This is "7 to the sixteenth power"
4 of them
11 choices
slot method
1st slot: 11 choices
2nd slot: 10 choices (1 picked)
3rd slot: 9 choices (1 more picked)
4th slot: 8 choices (1 more picked)
11*10*9*8=7920
7920 ways
so the probabity is
1/7920
