Did I do this one right? My geometry didn't go over this topic too well

Mathematics

2 answers:

yan [13]4 years ago

6 0

Yes
U r very good
Can u teach me I’m new
My actual name Naheed

Fynjy0 [20]4 years ago

6 0

Answer: Yes!! Your writting is amazing!

Step-by-step explanation:

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What is the exact circumference of a circle with a radius of 17 mm?

inn [45]

<h3>The exact circumference of a circle with a radius of 17 mm is $34 \pi$ or 106.76 mm</h3>

Solution:

Given that,

A circle with radius 17 mm

To find: circumference of circle

The circumference of circle is given as:

$C = 2 \pi r$

Where, "r" is the radius of circle

Substitute r = 17 mm

$C = 2 \times \pi \times 17\\\\C = 34\ \pi\\\\C = 34 \times 3.14\\\\C = 106.76$

Thus the exact circumference of a circle with a radius of 17 mm is $34 \pi$ or 106.76 mm

8 0

3 years ago

Suppose a sample of 972972 tenth graders is drawn. Of the students sampled, 700700 read above the eighth grade level. Using the

max2010maxim [7]

Answer:

The 85% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level is (0.259, 0.301).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

972 students, 700 read above the eight grade level. We want the confidence interver for the proportion of those who read at or below the 8th grade level. 972 - 700 = 272, so $n = 972, \pi = \frac{272}{972} = 0.28$