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
Flura [38]
3 years ago
14

assume that random guesses are made for 8 multiple choice questions on an SAT test, so that there are n=9 trials, each with prob

ability of success (correct) given by p=0.6. find the indicated probability for the number of correct answers. find the probability that the number x of correct answers is fewer than 4.
Mathematics
1 answer:
melamori03 [73]3 years ago
5 0

Answer:

P(x

Step-by-step explanation:

If we call x the number of correct questions obtained in the 9 attempts, then:

x is a discrete random variable that can be modeled by a binomial probability distribution p, with n = 9 trials.

So, the p of x successes has the following formula.

P(x) =\frac{n!}{x!(n-x)!}*p^x(1-p)^{n-x}

Where:

n = 9

p = 0.6

We are looking for P(x<4)

By definition:

P(x

Then:

P(x\leq3)=\sum_{x=0}^{3} \frac{9!}{x!(9-x)!}*(0.6)^x(1-0.6)^{9-x}

P(x\leq3)=0.0994

You might be interested in
X + 5y = -2
natita [175]

Answer:

the answer is -1. please thank my answer please and thank you

3 0
3 years ago
Please tell me what x is 3(x+6)=48
Alekssandra [29.7K]

Answer

X=10

Step by step explanation

48÷3 = 16

16-6 = 10

7 0
3 years ago
400 people are asked if they drink tea
Korvikt [17]

Answer:

56 people drink 3 cups daily

Step-by-step explanation:

What's the total number of people that drink 3 cups?

Total number of people = 400

7 / 10 were asked said yes

Number of people that said yes = (7 / 10) × 400 = 280

280 people drink tea.

20% of 280 people drink 3 cups daily, whats the number = ?

20% of 280 = ?

20 / 100 = x / 280

(20 × 280) = (100 × x)

5600 = 100x

X = 5600 / 100

X = 56 people

56 people drink 3 cups of tea daily.

5 0
3 years ago
Emily took 300 US dollars to the bank to exchange it for Canadian dollars. The exchange rate on that day was 1.25 Canadian dolla
Paha777 [63]

Emily wanted to exchange her 300 US Dollars for Canadian Dollars.

The exchange rate for it was 1.25 Canadian Dollars for 1 US Dollar.

This means that 1 US Dollar = 1.25 Canadian Dollars.

So if we were to follow this pattern,

2 US Dollars = 2 × 1.25 = 2.5 Canadian Dollars

3 US Dollars = 3 × 1.25 = 3.75 Canadian Dollars

4 US Dollars = 4 × 1.25 = 5 Canadian Dollars

So for 300 US Dollars, we'll need to multiply 300 by 1.25.

300 US Dollars = 300 × 1.25 = 375 Canadian Dollars.

Hope it helps. :)

4 0
2 years ago
Tim is 2 more than twice Angie's age. If Angie in 20 years old, how old is Tim?
Vera_Pavlovna [14]
If Tim is 2 more than twice angies age, Tim is 42.
7 0
3 years ago
Other questions:
  • F(x) = −(x2 + x − 72) what is the axis of symmetry and write it in standard form
    8·1 answer
  • A total of 804 tickets were sold for the school play. They were either adult tickets or student tickets. There were 54 more stud
    13·1 answer
  • What is the value of 8/36 in lowest terms?<br> A. 4/18<br> B. 1/2<br> C.2/9<br> D. 1/4
    7·1 answer
  • What is 9+(-3)=??<br> Someone please help me
    12·2 answers
  • PLEASE HELP ME I NEG YOU I REALY NEEE DHELP
    10·1 answer
  • What percent of 1 3/5 is 0.2 and what percent of 2 is 0.2?
    14·1 answer
  • A car and truck are 540 miles apart. The two vehicles start driving toward Each other at the same time. The car drives at a spee
    14·1 answer
  • Use the distributive property to write each expression then evaluate it 7(7-9)
    12·2 answers
  • If the diameter of a regulation size basketball is 9.4 inches, what is the surface area? Round to the nearest tenth.
    7·2 answers
  • How do find Herons formula?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!