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
adoni [48]
3 years ago
5

7. The probability that a randomly chosen student will be left-handed is .09: a) In a class of 108, find the probability that th

ere will be (exactly) 8 left-handed students. b) The classroom has 12 desks designed for people who are left-handed. Use an appropriate approximate method to find the probability that there are enough for all the left-handed students.
Mathematics
1 answer:
vampirchik [111]3 years ago
7 0

Solution :

Let x be student will be left handed

P = 0.09

Using the normal approximation to binomial distribution,

a). n = 108,

    μ = np = 9.72

    $\sigma = \sqrt{np(1-p)}$

       $=\sqrt{8.8452}$

       = 2.9741

Required probability,

P(x=8) = P(7.5 < x < 8.5)

$=P\left(\frac{7.5-9.72}{2.9741}< \frac{x-\mu}{\sigma}< \frac{8.5-9.72}{2.9741}\right)$

$=P(-0.75 < z < -0.41)$

Using z table,

= P(z<-0.41)-P(z<-0.75)

= 0.3409-0.2266

= 0.1143

b). P(x=12) = P(11.5 < x < 12.5)

$=P\left(\frac{11.5-9.72}{2.9741}< \frac{x-\mu}{\sigma}< \frac{12.5-9.72}{2.9741}\right)$

$=P(0.60 < z < 0.94)$

Using z table,

= P(z< 0.94)-P(z< 0.60)

= 0.8294 - 0.7257

= 0.1006

You might be interested in
30 POINTS URGENT! When solving the following system of equations, which variable would be the easiest to solve for?
AnnyKZ [126]

Answer:

b

Step-by-step explanation:

8 0
3 years ago
Which function is an odd function?
Mrac [35]

Answer:

Algebraically, f is even if and only if f(-x) = f(x) for all x in the domain of f. A function f is odd if the graph of f is symmetric with respect to the origin. Algebraically, f is odd if and only if f(-x) = -f(x) for all x in the domain of f.

Step-by-step explanation:

7 0
3 years ago
Tanelle is cutting out a paper banner as shown in the image. The entire piece of paper is 8 feet long and she is cutting a circl
Mrac [35]

Answer: 4.71

Step-by-step explanation:

4 0
2 years ago
What is 33 photos into two grours so the ratio is 4 to 7
Keith_Richards [23]
ratio:\\4:7\to4+7=11\\\\33:11=3\\\\therefore\\\\4:7\\\downarrow\\4\times3=12\\7\times3=21\\\\Answer\huge\boxed{12:21}
7 0
3 years ago
Read 2 more answers
Group of answer choices<br><br> Phone A<br><br> Phone B<br><br> Phone C<br><br> Phone D
Otrada [13]

Answer:

Phone B

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • Fraction calculator 66 1/2 - 43=
    7·2 answers
  • How do i solve this solution: 2x+4y=-7<br> 4x-2y=6
    14·1 answer
  • The value of x in x + 7 = 15 is_____​
    6·2 answers
  • Tyler's mom purchased a savings bond for Tyler. One year after it was purchased, the value of the savings bond was $156. If the
    11·1 answer
  • 2x+1 cual es su respuesta ??
    5·2 answers
  • Hellllllllllllllllllp...
    8·1 answer
  • Given the ordered pairs (5,3), (-4, 2) and (-2,-6)
    9·2 answers
  • Emma has $0.95 in dimes and nickles. She has five more dimes than nickles. How many coins of each type does she have?
    10·1 answer
  • On the scale drawing of a car, the length from bumper to bumper is 6 inches. The car’s actual length, from bumper to bumper, is
    8·1 answer
  • How many 3 letter "words" can be formed from the standard 26 letter alphabet, if the first letter must be a vowel (A, E, I, O, o
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!