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ss7ja [257]
3 years ago
13

A multiple choice test has 12 questions each of which has 5 possible answers, only one of which is correct. If Judy, who forgot

to study for the test, guesses on all questions, what is the probability that she will answer
a) exactly 3 questions correctly?
b) all the questions incorrectly?
c) at least 5 questions correct?
d) at most 4 questions incorrect?
Mathematics
1 answer:
pochemuha3 years ago
7 0

Answer:

Not exactly sure but maybe these percentages that i found can help you

Step-by-step explanation:

if there are 12 questions then there are 12 correct answers out of 60 total answers 12 divided by 60 = 0.20 which is 20 percent so upon guessing she has a theoretical 20 percent chance to get all questions correct

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Firdavs [7]

Answer:

4a: 1

4b: 6, -6

Step-by-step explanation:

4a. (3 - 5)= -2; (9 - 6)=3

(-2 + 3) = 1

4b. We aren't told which cards Jesse pick up, only that they didn't affect his total points. Therefore, the two cards have the same number, but opposite signs. We coluld pick any teo an an example: 6 and -6, or 4 and -4, etc. They don't affect his score since they ccancel each other with a result of zero.

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3 years ago
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Maksim231197 [3]

Answer:

32 squared ft

Step-by-step explanation:

7 0
3 years ago
Noah drew 26 hearts, 21 stars, and 38 circles. what is the ratio of stars to hearts to circles?
mamaluj [8]

Answer:

21:26:38

Step-by-step explanation:

Ratio in mathematics is the relationship between two or more amounts, showing how many times they can be contained in one another.

Example: 1:2 means there are two times the first amount in the second.

For the case above;

Given;

Number of each shape noah drew;

hearts = 26

Stars = 21

circles = 38

The ratio of stars to hearts to circles

N(stars) : N(hearts) : N(circles)

21:26:38

Since they are not divisible by a common factor the ratio remains;

21:26:38

5 0
3 years ago
Joyce is training for a race the ratio of the number of minutes she runs to the number of miles she wants is 24 to 3 she plans t
CaHeK987 [17]

Answer:

84

Step-by-step explanation:

6 0
3 years ago
Family Video charges $10 for
Irina18 [472]

Answer:

4 movies, $20

Step-by-step explanation:

Given data

Family Video

charges $10 for a monthly membership and

$2.50 per movie

let the number of movies be x

and the charge for x movies be y

y= 10+2.5x----------1

Babe's  Movies

charges a $12

membership and $2 per

movie.

let the number of movies be x

and the charge for x movies be y

y= 12+2x----------2

equate 1 and 2

10+2.5x= 12+2x

collect like terms

12-10= 2.5x-2x

2= 0.5x

x= 2/0.5

x= 4 movies

put x= 4 in equation 1 or 2

y= 12+2x----------2

y= 12+2*4

y= 12+8

y= $20

4 0
3 years ago
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