1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nordsb [41]
3 years ago
13

A student takes a multiple choice test with 40 questions. The probability that a student answers a given question correctly is 0

.5, independent of all other questions. The probability that the student answers more than N questions correctly is greater than 0.10. The probability that the student answers more than N+1 questions correctly is less than 0.10. Calculate N using normal approximation with continuity correction. Answer is 23. Please explain your work.
Mathematics
1 answer:
LenKa [72]3 years ago
6 0

Answer:

Step-by-step explanation:

X no of questions student answers is binomial with n =40 and p =0.5

If approximated to normal, X is Normal with

mean = np = 20 and variance = npq = 10

P(X>N) >0.10

We use std normal distribution table to get z value first then convert to x value

z>-1.28

So x>20-1.28(10) = 20-12.8 = 7.2

This is with continuity correction.

Hence without continuity correction this equals 7.2-0.5 = 6.7

x>6.7

n = 7

You might be interested in
Writing expressions word prob
insens350 [35]
Don’t follow the link he or she gave you.
7 0
3 years ago
The perimeter of a rectangular painting is 304 centimeters. If the length of the painting is 85 centimeters, what is its width?
Brums [2.3K]

Answer:

3.58

Step-by-step explanation:

You have to divide 304 by 85

you will get 3.57647058824

You have to round it to the nearest hundedth which will leave you with 3.57

4 0
2 years ago
A home appliance salesperson wants to earn a total of 3,600 next mouth including his base salary and commissions. He earns a bas
jenyasd209 [6]

$14,000 each month

$14,000 × 20% = $2800

$2800 + $800 = $3600

3 0
3 years ago
Please help me with this
Citrus2011 [14]

I don't know the answer because of how zoomed in it is. But, you could make a cordinate grid and plot all of the numbers. Then, you would connect all of the lines and you will see that one line is missing in the parallelogram. You finish off that line yourself and write down the cordanite that you needed to complete the parallelogram. You will lastly put U=answer (the cordanite you got from finishing off the parallelogram).

5 0
3 years ago
Find the value of x in a triangle with one side 11 and 1 angle being 28​
Andre45 [30]

Answer:

C: 12.5

Step-by-step explanation:

The sides x and 11 could be defined as the Adjacent angle and the Hypotenuse. This means that we will use the cos function to solve this.

First we can set up our equation

cos28=\frac{11}{x}

Next we can solve for x by multiplying by x and dividing by cos 28

x=\frac{11}{cos28}\\\\x=12.458\\\\x=12.5

4 0
3 years ago
Read 2 more answers
Other questions:
  • What is the inequality that represents the range of the function g(x)=-3/4x^2 when the domain is restricted to -4
    9·1 answer
  • I think its B..
    13·1 answer
  • There were 5 people who bought
    6·2 answers
  • Which expression is equivalent to 9(-4b - 3)?<br> -4b - 27<br> -36b - 27<br> -27b - 36<br> -36b - 3
    13·2 answers
  • Devon started the week with $50 in his checking account. On Monday he took $20 out of the
    10·2 answers
  • 20% of the tickets sold at a school carnival were early-admission tickets. If the school sold 30 tickets in all, how many early-
    12·1 answer
  • The three angles of a triangle have
    14·1 answer
  • This is due today please help if you get it right you get brainliest if you get it!
    14·1 answer
  • Pls help<br> Use the rhombus to answer the question
    15·1 answer
  • How is the e - lambda figured out as 0.00248?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!