The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.2 ppm and standard deviation 1.4 ppm. 37 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. What is the distribution of
X
?
X
~ N(
8.5
,
1.5
)
What is the distribution of
¯
x
?
¯
x
~ N(
8.5
,
0.237
)
What is the probability that one randomly selected city's waterway will have less than 8.9 ppm pollutants?
0.3936
For the 37 cities, find the probability that the average amount of pollutants is less than 8.9 ppm.
For part d), is the assumption that the distribution is normal necessary? YesNo
Find the IQR for the average of 37 cities.
Q1 =
ppm
Q3 =
ppm
IQR:
ppm

the answer is x equals 50, this is because the two angles are the same measurements because they are vertical angles. in corresponding angles, vertical angles are two angles with one diagonally above another. those two angles will be the same measurements.

110 - 10 = 100

100 / 2 = 50

x   = 50

110 = 2(50) + 10 = 110

110 = 110

can u give brainliest if i'm correct?

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.