Answer:
see explanation
Step-by-step explanation:
(a)
← divide numerator and denominator by 4
= = 0.8
(b)
→ divide numerator and denominator by 5
= = 0.7
(c)
← divide numerator and denominator by 4
= = 1.5
5.4 divide by 0.12 equals 45
Answer:
The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
That is z with a pvalue of , so Z = 1.28.
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 7.6 - 0.1 = 7.5
The upper end of the interval is the sample mean added to M. So it is 7.6 + 0.1 = 7.7
The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.
2<span>x<span><span></span></span></span>² <span><span><span> </span></span></span>+ 2x − 2<span>4
</span><span>GCF = 2
2(2x</span>²/2 + 2x/2 - 24/2)
<span>
2(x - 3)(x + 4)</span>
Out of what? Nothing is shown. :(