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DiKsa [7]
3 years ago
14

Help me with this pls

Mathematics
1 answer:
melomori [17]3 years ago
5 0
A and E, they are basically at the same point around
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Randy and Sandy have a total of 20 books between them. After Sandy loses three by leaving them on the bus, and some birthday gif
nasty-shy [4]

Answer:

Randy had 13 books an Sandy had 7 books.

Step-by-step explanation:

20 - 3 = 17

30 - 17 = 13

13 x 2 = 26

26 + 4 = 30

13 + 7 = 20

Hope this helps! Please mark as brainliest.

3 0
3 years ago
Which of the following statements is not true?
bezimeni [28]
All of the above are true
6 0
3 years ago
A new medical test provides a false positive result for hepatitis 2% of the time that is a perfectly healthy subject being teste
Oxana [17]
Given that X <span>be the number of subjects who test positive for the disease out of the 30 healthy subjects used for the test.

The probability of success, i.e. the probability that a healthy subject tests positive is given as 2% = 0.02


Part A:

</span><span>The probability that all 30 subjects will appropriately test as not being infected, that is the probability that none of the healthy subjects will test positive is given by:

</span>P(X)={ ^nC_xp^x(1-p)^{n-x}} \\  \\ P(0)={ ^{30}C_0(0.02)^0(1-0.02)^{30-0}} \\  \\ =1(1)(0.98)^{30}=0.5455
<span>

Part B:

The mean of a binomial distribution is given by

</span>\mu=np \\  \\ =30(0.02) \\  \\ =0.6
<span>
The standard deviation is given by:

</span>\sigma=\sqrt{np(1-p)} \\ \\ =\sqrt{30(0.02)(1-0.02)} \\ \\ =\sqrt{30(0.02)(0.98)}=\sqrt{0.588} \\  \\ =0.7668
<span>

Part C:

This test will not be a trusted test in the field of medicine as it has a standard deviation higher than the mean. The testing method will not be consistent in determining the infection of hepatitis.</span>
5 0
3 years ago
When can two square roots or radicals be added/subtracted? Create an example of your own to explain your answer.
Gnom [1K]

Tbh i believe you have to subtracted it

6 0
3 years ago
Solve for x:<br> .<br> 3x – 1 = –2x + 39
zysi [14]

<em>x = 8</em>

Step-by-step explanation:

3x-1=-2x+39

Add 1 to both sides.

3x=-2x+40

Add 2x to both sides.

5x=40

Divide 40 by 5.

x = 8

5 0
3 years ago
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