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pogonyaev
3 years ago
10

There are 43 students in an elementary statistics class. On the basis of years of experience, the instructor knows that the time

needed to grade a randomly chosen first examination paper is a random variable with an expected value of 5 min and a standard deviation of 4 min. If grading times are independent and the instructor begins grading at 6:50 P.M. and grades continuously, what is the (approximate) probability that he is through grading before the 11:00 P.M. TV news begins? (Round your answers to four decimal places.)
Mathematics
1 answer:
gizmo_the_mogwai [7]3 years ago
8 0

Answer: it’s c

Step-by-step explanation:

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What does y equal ??!?!
garik1379 [7]
<h3>Answer:  658.3</h3>

==================================================

Explanation:

The adjacent complementary angle to that 28 degree angle is 62 degrees because 62+28 = 90.

If the reference angle is the upper acute angle 62 degrees, then the y is the opposite leg and the side 350 is the adjacent leg.

Use the tangent ratio

tan(angle) = opposite/adjacent

tan(62) = y/350

350*tan(62) = y

y = 350*tan(62)

y = 658.254262871217

y = 658.3

3 0
3 years ago
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#10 using right angle below find the tangent of angle A.
just olya [345]

Answer: the first option is the correct answer.

Step-by-step explanation:

Triangle ABC is a right angle triangle.

From the given right angle triangle,

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With m∠A as the reference angle,

AC represents the adjacent side of the right angle triangle.

BC represents the opposite side of the right angle triangle.

To determine the tangent of angle A, we would apply the Tangent trigonometric ratio. It is expressed as

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Rationalizing the surd, it becomes

1/√3 × √3/√3

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6 0
3 years ago
What is the remainder when 19x^2 + 15x + 12 is divided by x - 2?
Aleksandr-060686 [28]

Answer:

R = 118

Step-by-step explanation:

Given

Represent the polynomial with P and the divisor with D

P = 19x^2 + 15x + 12

D = x -2

Required

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We start by equating the divisor to 0

i.e.

D = 0

x - 2 = 0

x = 2

Substitute 2 for x in the polynomial.

This gives remainder (R)

R = 19*2^2 + 15*2 + 12

R = 19*4 + 15*2 + 12

R = 76 + 30 + 12

R = 118

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8 0
3 years ago
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blondinia [14]

Answer:

10

Step-by-step explanation:

let the number be n then half the number is \frac{1}{2} n, then

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3n = 30 ( divide both sides by 3 )

n = 10

Thus the number is 10

8 0
3 years ago
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Constantine picks two letters at random from the word constantinople with replacement. what is the probability that both letters
dedylja [7]
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P(2 letters are consonants with replacement) = 9/14 * 9/14 = 81/196
3 0
4 years ago
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