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
AysviL [449]
2 years ago
14

You wish to roll a 7 on and 8-sided die. What is the probability that the first 7 happens on the 3rd, 4th, or 5th try?

Mathematics
1 answer:
professor190 [17]2 years ago
7 0

Answer:

0.15%

Step-by-step explanation:

The probability of rolling a 7 on a 8-sided die will always be:

1/8

We know that for the first two tries that there is 7/8 chance that the die will land on anything but a 7:

=(7/8)\cdot{(7/8)}=49/64=0.77

For the die to land on a 7 the 3rd, 4th and 5th try is:

=(1/8)\cdot{(1/8)}\cdot{(1/8)}=1/512

The probability is therefore:

{1/512)\cdot{(49/64)}=49/32768=0.00149

The probability that the die will land on a 7 not on the first and second try but on the 3rd, 4th and 5th try is 0.15%

You might be interested in
21(2-y)+12y=44 find y​
miss Akunina [59]
Answer: y= -2/9
Explanation:
21(2-y)+12y=44
42-21y+12y=44
42-9y=44
-9y=2
y=-2/9
8 0
2 years ago
Read 2 more answers
((PLEASE HELP ASAP!! D:)) Natasha bought a tennis racket that was marked down in price, p, by 20%. Write an expression with TWO
kumpel [21]

Answer: p - 0.2p

Step-by-step explanation:

Given the following :

Original Price of tennis racket = p

Mark down or discount on original price = 20% of original price = (20/100) × p = 0.2p

Amount after discount = Amount paid by Natasha

Amount after discount = Original price - Discount

Amount after discount = p - 0.2p

Amount paid by Natasha = p - 0.2p

7 0
3 years ago
An Air Force plane flew to the
Free_Kalibri [48]

Answer:

5 hours

Step-by-step explanation:

Time taken for trip : t + 1

Time taken for return : t

Avg. speed (trip) : 256 km/h

Avg. speed (return) : 320 km/h

The distances covered on both trips are equal.

⇒ Distance (trip) = Distance (return)

⇒ Speed (trip) × time (trip) = Speed (return) × time (return)

⇒ (256)(t + 1) = (320)(t)

⇒ 256t + 256 = 320t

⇒ 64t = 256

⇒ t = 4 hours

<u>Time (trip)</u> = t + 1 = 4 + 1 = 5 hours

4 0
2 years ago
A multiple-choice standard test contains total of 25 questions, each with four answers. Assume that a student just guesses on ea
weqwewe [10]

Answer:

a)  8*88*10⁻⁶ ( 0.00088 %)

b) 0.2137 (21.37%)

Step-by-step explanation:

if the test contains 25 questions and each questions is independent of the others, then the random variable X= answer "x" questions correctly , has a binomial probability distribution. Then

P(X=x)= n!/((n-x)!*x!)*p^x*(1-p)^(n-x)

where

n= total number of questions= 25

p= probability of getting a question right = 1/4

then

a) P(x=n) = p^n = (1/4)²⁵ = 8*88*10⁻⁶ ( 0.00088 %)

b) P(x<5)= F(5)

where F(x) is the cumulative binomial probability distribution- Then from tables

P(x<5)= F(5)= 0.2137 (21.37%)

7 0
3 years ago
A right triangle has a side length of 12 m and a side length of 15 m. Find the length of the missing hypotenuse. Rounded to the
kolezko [41]

Answer:

19.2

Step-by-step explanation:

12 squared + 15 squared= C squared

144 + 225 = C squared

369 = C squared

Do square root of 369, which is

19.2

7 0
2 years ago
Other questions:
  • What is the range of the function y= ^3 square root x-5
    11·1 answer
  • -12 + (-5)= someone plz help
    14·1 answer
  • Determine if the properties define a ray or a line segment
    9·2 answers
  • 24 x 0.17 lol help pls
    12·1 answer
  • your family leaves your town traveling at an average rate of 45 mi/h two hours later, your neighbor leaves town traveling along
    8·1 answer
  • Two positive, consecutive, odd integers have a product of 143.
    13·2 answers
  • Blaise’s school is selling tickets to a fall musical. On the first day of ticket sales they sold 8 adult tickets and 3 student t
    11·1 answer
  • Three fourths of a class brought bundles of old papers to school. If 40 students were in class, how many students brought papers
    5·1 answer
  • Translate the following:<br> One half of a number (use x) is equal to 8 less than the same number.
    15·2 answers
  • The mean price of a new laptop computer from Store #1 is $799.99, and they only sell two brands of computers. The mean price of
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!