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3 years ago

Maths question I'm struggling with.

Mathematics

1 answer:

Alex17521 [72]3 years ago

6 0

Answer:

A = 2.63

B = 2

Step-by-step explanation:

To find the population density, what we need to do simply is divide the population by the area of the UK

mathematically, that would be;

(6.41 * 10^7)/243,610 = 263.125

To the nearest whole person= 263 people/ square meter

So now we want to write 263 in standard form = 2.63 * 10^2

So this means A = 2.63 and B = 2

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* The American Diabetes Association estimates that 8.3% of people in the

Leto [7]

Answer:

The probability that the diagnosis is correct is 0.95249.

Step-by-step explanation:

We are given that the American Diabetes Association estimates that 8.3% of people in the United States have diabetes.

Suppose that a medical lab has developed a simple diagnostic test for diabetes that is 98% accurate for people who have the disease and 95% accurate for people who do not have it.

Let the probability that people in the United States have diabetes = P(D) = 0.083.

So, the probability that people in the United States do not have diabetes = P(D') = 1 - P(D) = 1 - 0.083 = 0.917

Also, let A = event that the diagnostic test is accurate

So, the probability that a simple diagnostic test for diabetes is accurate for people who have the disease = P(A/D) = 0.98

And the probability that a simple diagnostic test for diabetes is accurate for people who do not have the disease = P(A/D') = 0.95

Now, the probability that the diagnosis is correct is given by;

Probability = P(D) $\times$ P(A/D) + P(D') $\times$ P(A/D')

= (0.083 $\times$ 0.98) + (0.917 $\times$ 0.95)

= 0.08134 + 0.87115

= 0.95249

Hence, the probability that the diagnosis is correct is 0.95249.

8 0

3 years ago

Students are selling hand-made magnets at the school craft fair. One magnet costs $0.30, 2 magnets cost $0.43, 3 magnets cost $0

Sliva [168]

1 = 0.30
2 = 0.43
3 = 0.56
4 = 0.69
5 = 0.82
6= 0.95

To find by how much you are adding every time , you have to subtract the 2 magnet cost (0.43) from the 1 magnet cost (0.30) and this equals 0.13

6 0

4 years ago

Candice bought 2 dozen eggs 9 of the eggs were bad . what percentage of the eggs were good

Dominik [7]

Answer:

63%

Step-by-step explanation:

2 dozen eggs is 24

24-9=15

15/24=.625 but when you rounded .63

4 0

3 years ago

When two statements are connected with the word or, the new statement is called a

Alex_Xolod [135]

Disjunction would be statements connected with or.

Brainliest?

7 0

3 years ago

Read 2 more answers

Shorty’s Muffler advertises it can install a new muffler in 30 minutes or less. However, the work standards department at corpor

pav-90 [236]

Answer:

The installations at the Maumee branch would you expect to take more than 30 minutes is 10.

Step-by-step explanation:

Consider the provided information.

Let x is the installations at the Maumee branch take more than 30 minutes.

The work standards department at corporate headquarters recently conducted a study and found that 20% of the mufflers were not installed in 30 minutes or less.

Therefore, π=0.20

The Maumee branch installed 50 mufflers last month.

Thus, n=50

Mean of the distribution: μ=nπ

Substitute the respective values in the above formula.

μ=(50)(0.20)

μ=10

Hence, the installations at the Maumee branch would you expect to take more than 30 minutes is 10.

7 0

4 years ago