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pentagon [3]
3 years ago
11

~HELP WITH MATH PLZ~

Mathematics
1 answer:
madreJ [45]3 years ago
5 0
1. Answer=B
-5.6°- -17.5°=-5.6°+17.5°=11.9°

2.Answer= $147
-$17- -$164=-$17+$164=$147

3.Answer=$10.35
$15.00-$3.25-$1.40=$
$15.00-$4.65=$10.35

4.Answer=A

5.Answer=C
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g A sample of 3 items is chosen at random from a box containing 20 items, out of which 4 are defective. Let X be the number of d
professor190 [17]

Answer:

The variance and standard deviation of <em>X</em> are 0.48 and 0.693 respectively.

The variance and standard deviation of (20 - <em>X</em>) are 0.48 and 0.693 respectively.

Step-by-step explanation:

The variable <em>X</em> is defined as, <em>X</em> = number of defective items in the sample.

In a sample of 20 items there are 4 defective items.

The probability of selecting a defective item is:

P (X)=\frac{4}{20}=0.20

A random sample of <em>n</em> = 3 items are selected at random.

The random variable <em>X</em> follows a Binomial distribution with parameters <em>n</em> = 3 and <em>p </em>= 0.20.

The variance of a Binomial distribution is:

V(X)=np(1-p)

Compute the variance of <em>X</em> as follows:

V(X)=np(1-p)=3\times0.20\times(1-0.20)=0.48

Compute the standard deviation (σ (X)) as follows:

\sigma (X)=\sqrt{V(X)}=\sqrt{0.48}=0.693

Thus, the variance and standard deviation of <em>X</em> are 0.48 and 0.693 respectively.

Now compute the variance of (20 - X) as follows:

V(20-X)=V(20)+V(X)-2Cov(20,X)=0+0.48-0=0.48

Compute the standard deviation of (20 - X) as follows:

\sigma (20-X)=\sqrt{V(20-X)} =\sqrt{0.48}0.693

Thus, the variance and standard deviation of (20 - <em>X</em>) are 0.48 and 0.693 respectively.

3 0
3 years ago
Correct answer gets brainliest!<br>find two expressions whose difference is 3x + 4​
il63 [147K]

Answer:

(7x+4) and (4x)

Step-by-step explanation:

The two expressions are (7x+4) and (4x)

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3 years ago
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liubo4ka [24]

Answer:

Step-by-step explanation:

The square indicates that the total angle is 90 degrees so

d+59=90

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d=31 degrees

4 0
2 years ago
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The resting heart rate of an adult is usually about 60 beats per minute. Use your completed table to find approximately how many
Dvinal [7]
60x=1,000,000
----- ---------------
60 60
X=16,666 2/3 or
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3 years ago
Mhanifa could you please answer this last question for me. What is MXH in the circle below? A.Major arc, B.Minor Arc, C Semicirc
Nookie1986 [14]

Answer:

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Step-by-step explanation:

MH is the diameter and it divides the circle in half.

MXH is the arc between the endpoints of the diameter, therefore is  semicircle.

Correct choice is C

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