![noslengerman](/avatars/23366.jpg)
noslengerman
30.10.2019 •
Mathematics
Arsenic is a compound that occurs naturally in very low concentrations. arsenic blood concentrations in healthy adults are normally distributed, with mean =3.2μ=3.2 micrograms per deciliter /dl)(μg/dl) and standard deviation =1.5 /dlσ=1.5 μg/dl . what is the range of arsenic blood concentrations corresponding to the middle 90% of healthy adults?
Solved
Show answers
More tips
- A Auto and Moto Discovering the Leader: What is the Most Expensive Car in the World?...
- H Health and Medicine Hangover: How to Get Rid of It Quickly?...
- S Style and Beauty How to Choose the Right Fur Coat and Avoid Regrets?...
- C Computers and Internet How to Create a Folder on Your iPhone?...
- G Goods and services How to sew a ribbon: Tips for beginners...
- F Food and Cooking How to Make Mayonnaise at Home? Secrets of Homemade Mayonnaise...
- C Computers and Internet Which Phone is Best for Internet Surfing?...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
Answers on questions: Mathematics
- M Mathematics Identify the domain and range of the function. f(x)= -3 x^2 - 2...
- M Mathematics What’s the answer to this...
- M Mathematics A plane is 3.5 miles above the ground. The pilot sights the airport at an angle of depression of 20 ∘. To the nearest tenth of a mile, what is the ground distance between...
- M Mathematics SOMEONE PLS PLS HELP WITH THIS EASY MATH QUESTION, ITS DOWN BELOW AND EXPLANTION NEEDED!!...
- M Mathematics - 9 + 12 x (-1/3)+2÷1/9=...
- M Mathematics What is (10 x 8) + 29 = ?...
- M Mathematics 3/4 (x) − 1.72 = −6.82 please have a explanation...
- M Mathematics Which best describes this quadrilateral? All angles are right angles. o Only one pair of sides is parallel. o All sides are different lengths. o Opposite sides are parallel....
- M Mathematics 1.You have 2 containers - Container A is at 3 litres and Container B is at 5 litres. 2. Exert for the marking showing that shows the total capacity both containers have NO...
- M Mathematics Simplify the following expression. X4+3x3-2x3-5x2-x+x2+x+1+7x4...
Ответ:
range of arsenic blood concentrations: 0.725 μg/dl - 5.675 μg/dl
Step-by-step explanation:
Data
μ=3.2 μg/dl
σ=1.5 μg/dl
Let's call x1 the maximum arsenic blood concentrations and x2 the minimum concentration for the range corresponding to the middle 90% of healthy adults. To get x1 is necessary to find the x for that the area below the standard normal distribution is 0.45. In table attached it can be seen that this area correspond to Z = 1.65. Using Z definition, x1 can be isolated
Z = (x1-μ)/σ = 1.65
x1 = 1.65*σ + μ
x1 = 1.65*1.5 + 3.2
x1 = 5.675 μg/dl
Knowing that normal distribution is symmetrical respect to 0, then the area between Z = -1.65 and Z = 0 is also 0.45. So, x2 is computed as
Z = (x2-μ)/σ = -1.65
x2 = -1.65*σ + μ
x2 = -1.65*1.5 + 3.2
x2 = 0.725 μg/dl
Ответ:
x = -6
x = 3/2 = 1.500
x = 0
Step-by-step explanation: