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Deffense [45]
3 years ago
10

The Environmental Protection Agency is concerned with the problem of setting criteria for the amounts of certain toxic chemicals

to be allowed in freshwater lakes and rivers. A common measure of toxicity for any pollutant is the concentration of the pollutant that will kill half of the test species in a given amount of time (usually 96 hours for fish species). This measure is called LC50 (lethal concentration killing 50% of the test species). In many studies, the values contained in the natural logarithm of LC50 measurements are normally distributed, and, hence, the analysis is based on ln(LC50) data. Studies of the effects of copper on a certain species of fish (say, species A) show the variance of ln(LC50) measurements to be around .4 with concentration measurements in milligrams per liter. If n = 10 studies on LC50 for copper are to be completed, find the probability that the sample mean of ln(LC50) will differ from the true population mean by no more than .5.
Mathematics
1 answer:
ASHA 777 [7]3 years ago
6 0

Answer:

PROBABILITY, P = 0.9999

Step-by-step explanation:

1) Going by the central limiting theorem:

z= (x⁻ - μ) /( б√n)   Follows normal distribution with mean 0 and variance 1.

Where

x⁻= sample mean,

μ = population mean,

б = population standard deviation

n= sample size

The required probability is

 P(z < 0.5/(0.4/√ 10)

=P(z < 3.95)

P = 0.9999

Thus, probability, P=0.9999

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since the base of the refraction cup is a half circle how can you find the radius, what is the radius.
Anettt [7]

Answer:

The radius is half the diameter

Step-by-step explanation: what it is

4 0
3 years ago
Paolo paid $ 28 $ 28 for a hat that was originally priced at $ 35 $ 35 . By what percent was the hat discounted?
devlian [24]

The original price of the hat is $35. Paolo paid $28 for the hat.

So discount for the hat is $(35-28) = $7

$7 is discounted from $35. We have to find the percentage of the discount.

To find the percentage we have to divide the discount amount by the original price and then have to multiply it by 100.

So the discount percentage =

((7/35)×100) %

We can simplify 7/35 by dividing 7 and 35 both by 7. So we will get 1/5 after simplifying.

((1/5) ×100) %

(100/5)% = 20%

So the hat was discounted by 20%.

5 0
3 years ago
How to differenciate natural,whole,integers,rational,irrational numbers and real numbers sets from -12 to 49 and draw numbers li
slavikrds [6]

Answer:

Step-by-step explanation:

Natural Numbers :

These are numbers used for counting, they are the numbers on a number line. From -12 to 49, the natural numbers are 1, 2, 3, ..., 49.

Whole Numbers:

These are numbers that can be written without havin to write in fractions. They are 0, 1, 2, ..., 49.

Rational Numbers:

These are numbers that can be expressed as fractions.

Irrational numbers :

These are numbers that cannot be expressed as fractions.

Real Numbers:

These are numbers that can be used to measure quantities, they include negative, positive numbers and zero. From -12 to 49, all the numbers are real.

Prime Numbers:

These are numbers that are divisible only by one and themselves.

From 7 to 49, the numbers divisible by 7 are 7, 14, 21, 28, 35, 42, and 49.

Only 7 is prime.

3 0
3 years ago
Larson uses his credit card to purchase a new video game system for $519.82. He can pay off up to $225 per month. The card has a
Wewaii [24]
Answer: $11.57
Answer Explanation: Math
3 0
3 years ago
1. You are making gift bags to give to your friends at a birthday party. You have 36 candy bars, 24 pencils, and 48 erasers to d
Mnenie [13.5K]

iAnswer: i belive it is 12


Step-by-step explanation: theGCF of 36 and 24 is 12 the GCF of 36 and 48 is 12 and the GCF of 48 and 24 is 12 and 24


PRT TWO: there would be 2 pencils in each bag 3  candy barsin each and 4 erasers in each because 24 divided by 12 = 2 36 divided by 12 = 3 and 48 dividedby 12 = 4

5 0
3 years ago
Read 2 more answers
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