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Bess [88]
3 years ago
5

HELP PLEASE WITH 5 QUESTIONS!!!

Mathematics
1 answer:
Lorico [155]3 years ago
7 0
C) 1.94
A) 35%
A) 200%
A) 270
A) 252
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A financial talk show host claims to have a 55.3 % success rate in his investment recommendations. You collect some data over th
baherus [9]

Answer:

There is a 25.52% probability of observating 4 our fewer succesful recommendations.

Step-by-step explanation:

For each recommendation, there are only two possible outcomes. Either it was a success, or it was a failure. So we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

In this problem we have that:

p = 0.553, n = 10

If the claim is correct and the performance of recommendations is independent, what is the probability that you would have observed 4 or fewer successful:

This is

P(X \leq 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4)

In which

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{10,0}.(0.553)^{0}.(0.447)^{10} = 0.0003

P(X = 1) = C_{10,1}.(0.553)^{1}.(0.447)^{9} = 0.0039

P(X = 2) = C_{10,2}.(0.553)^{2}.(0.447)^{8} = 0.0219

P(X = 3) = C_{10,3}.(0.553)^{3}.(0.447)^{7} = 0.0724

P(X = 4) = C_{10,4}.(0.553)^{4}.(0.447)^{6} = 0.1567

P(X \leq 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) = 0.0003 + 0.0039 + 0.0219 + 0.0724 + 0.1567 = 0.2552

There is a 25.52% probability of observating 4 our fewer succesful recommendations.

3 0
3 years ago
SOMEONE PLEASE HELP!!!!! I’m not quite sure
Arturiano [62]

Answer: I have no clue lol but if I had to guess I'd say A because it just seems like it stands out from the rest

Step-by-step explanation:

4 0
3 years ago
Simplify 9a + 5b - 7a + 6b
arlik [135]
9a + 5b - 7a + 6b 

(9a-7a)+(5b+6b)
  \text{Gather like terms} 

2a+11b  \text{Solution}
7 0
3 years ago
Read 2 more answers
Decrease £13.20 by 15% <br><br> With an explanation (working out) plzzzz
algol [13]

Answer:

£11.22

Step-by-step explanation:

100% = £13.20

50% = £6.60

10% = £1.32

5% = £0.66

so you would add 10% and 5% together which gives you 15% and 15% is £1.98

and then you could to £13.20 - £1.98 which equals to £11.22  

6 0
3 years ago
Two men are at the grocery store at noon. One walks 0.6 miles east and the other one walks 0.8 miles north. After that they stop
Anettt [7]
The north displacement and the east displacement can be viewed as simply the legs of a right triangle and the distance between them is just the magnitude of the hypotenuse so:

h^2=x^2+y^2, where h is the distance between the two points, x is the easterly distance and y is the northerly distance....

h^2=.8^2+.6^2

h^2=.64+.36

h^2=1

h=1

So they are one mile apart from each other.
3 0
3 years ago
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