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prohojiy [21]
3 years ago
14

A bin contains 72 light bulbs of which 10 are defective. If 5 light bulbs are randomly selected from the bin with replacement, f

ind the probability that all the bulbs selected are good ones. Round to the nearest thousandth if necessary. (Hint: sampling with replacement = independent events)
Mathematics
1 answer:
Serhud [2]3 years ago
7 0

Answer:

0.4735

Step-by-step explanation:

10 defective, 62 not defective

P(good) = 62/72 = 31/36

All 5 good:

(31/36)⁵ = 0.4734738145

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Round 14.354 to the nearest one.
Gnoma [55]

Answer:

14

Step-by-step explanation: hope this helps :)

3 0
3 years ago
The sum of the squares of two consecutive positive integers is 41. Find the two
Komok [63]

We have to present the number 41 as the sum of two squares of consecutive positive integers.

1² = 1

2² = 4

3² = 9

4² = 16

5² = 25

16 + 25 = 41

<h3>Answer: 4 and 5</h3>

Other method:

n, n + 1 - two consecutive positive integers

The equation:

n² + (n + 1)² = 41     <em>use (a + b)² = a² + 2ab + b²</em>

n² + n² + 2(n)(1) + 1² = 41

2n² + 2n + 1 = 41     <em>subtract 41 from both sides</em>

2n² + 2n - 40 = 0     <em>divide both sides by 2</em>

n² + n - 20 = 0

n² + 5n - 4n - 20= 0

n(n + 5) - 4(n + 5) = 0

(n + 5)(n - 4) = 0 ↔ n + 5 = 0 ∨ n - 4 =0

n = -5 < 0 ∨ n = 4 >0

n = 4

n + 1 = 4 + 1 = 5

<h3>Answer: 4 and 5.</h3>
7 0
3 years ago
Casey buys a bracelet. She pays for the bracelet and pays $0.72 $0.72dollar sign, 0, point, 72 in sales tax. The sales tax rate
Bogdan [553]

To find your answer you could type in the cost and multiply it by the tax rate, so $0.72 X $0.06(The tax rate )= $0.0432

You then subtract 0.0432 from 0.72 and get 0.6768

rounded it would be $0.68

Hope this is right..

4 0
3 years ago
Read 2 more answers
Determine the amplitude or period as requested. Period of a y = - 1/3 * sin x - 1/3 pi/3 1/3 d 2pi
zysi [14]

Answer:

Period = 2\pi

Step-by-step explanation:

Given

y = -\frac{1}{3} * \sin(x - \frac{1}{3})

Required

Determine the period

A sine function is represented as:

y =A \sin(Bx + C) + D

Where

Period = \frac{2\pi}{B}

By comparing:

y =A \sin(Bx + C) + D and y = -\frac{1}{3} * \sin(x - \frac{1}{3})

Bx = x

So:

B = 1

So, we have:

Period = \frac{2\pi}{B}

Period = \frac{2\pi}{1}

Period = 2\pi

Hence, the period of the function is 2\pi

6 0
3 years ago
PLEASE HELP i dont know how to do this show the work please
NISA [10]
The area is 111 in. and the decimal version of that is either 0.07163 cm or 111.0 in.
8 0
3 years ago
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