Answer:
Confidence interval is 128±2.326 days (between 125.674 days and 130.326 days) in 90% confidence level
Step-by-step explanation:
Confidence interval can be calculated as M±ME where
- M is the average pregnancy days of smoking women and
- ME is the margin of error in 90% confidence level.
Margin of Error in 90% confidence level can be calculated using the formula:
ME=
where
- z is the z-value in 90% confidence level (1.645)
- s is the standard deviation of pregnancy length (16)
- N is the sample size (128)
putting these numbers in the formula, we get:
ME=
=2.326
then confidence interval is 128±2.326 ( between 125.674 and 130.326 ) in 90% confidence level
The material is made of carbon composite since the density of this material is similar to the drone
<h3>What is density?</h3>
Density is mass per unit volume. It is is an important property of a material that helps in saying other features of the material. It also says substance that has more weight as a highly dense substance will have more weight when compared with a less dense substance.
<u>Given data</u>
Initial volume of water = 1000ml
the drone displaced the water to 2290 ml
mass of the drone = 2 kg = 2000 g
<h3>Density of the drone</h3>
volume of the drone equals the volume of water displaced
2290 ml - 1000 ml = 1290 ml
density in g/cm*3
= mass / volume
= 2000 / 1290
= 1.550 g/ml
The density of the drone is similar to density of carbon composite hence the drone of made of carbon composite
Read more on density here: brainly.com/question/17780219
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22a) Matts' weekly fee is $7.50. We know this is by looking at the Y-axis. If he doesn't sell any books at the beginning of the week, his earnings are at -$7.50. We can assume that he pays that much for internet fee.
22b) Matt makes $1.50 for each book he sells. We know this because if you look at (5,0) and then the next one (6, 1.5), we see that his Y-value has increased by $1.50, which is equal to one book because 6 - 5 = 1 book.
22c) y = 1.5x - 7.5
22d) I'm going to assume that question means $30 in profit. Let's plug in the 30 in the equation. 30 = 1.5x - 7.5. Simplify.
Matt has to sell 25 books to make $30
Answer:
D
Step-by-step explanation:
because the slope is 7 and y-int is 6
so, u must use y=mx+c
just replace the slope and y-int into that formula
