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ki77a [65]
3 years ago
15

Elaine is taking a test that has multiple choice questions,each with 4 answer choices. She comes to a question for which she doe

s not know the awnser. If she can rule out three of the choices as wrong, by how much does she improve her probability of guessing correct awnser?
Mathematics
1 answer:
jekas [21]3 years ago
5 0

Assuming There is ONLY ONE CORRECT ANSWER,

The probability of her guessing the answer without ruling out the choices is 1/5.

if 3 choices are ruled out, then 1 out of the remaining two is right, which gives the probability 1/2

now, 1/5 = 20% , while 1/2 = 50%.

Therefore her probability of getting the correct answer improves by 30% [ not much in a REAL test though :P ]

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PLEASE HELP I WILL GIVE BRAINLIEST TO ANYONE WHO KNOWS THE RIGHT ANSWER AND HELPSS.
IceJOKER [234]

the answer is simply if u paid attention in class u would know but i will still tell ya its the first one

5 0
3 years ago
We will use the elimination method to solve the following system of
quester [9]

Answer:

x = 3

y = -5

Step-by-step explanation:

It would be very easy to eliminate y by adding the two equations,

   4x - 7y = 47

   <u>6x + 7y = -17</u>

   10x       = 30

      x = 3                     4(3) - 7y = 47

                                   12 - 7y = 47

                                       -7y = 35

                                          y = -5

Check:  See if the values work in the second equation

6(3) + 7(-5)

= 18 - 35

= -17             It looks like they work, so we know we have the correct values

7 0
3 years ago
Solve for a. + 7 = 2 What is the root? If there is no root, choose none.
Novay_Z [31]
There is no root soo

4 0
3 years ago
The plane flew over a beacon which is 280 miles from bristol. write down the gmt times when the plane flew over the beacon.
eimsori [14]

According to graph, GMT time when the plane flew over the beacon was 9:24.

While looking closely at the graph on x axis , one will notice that each hour is divided into 5 parts and hence each part has 12 minutes. looking at y axis, one may find that each part on y axis resembles 20miles. Hence at 280 miles away from Bristol, The GMT time is 9:24.

<h3>What is a graph?</h3>
  • In mathematics, a graph is a visual representation or diagram that shows facts or values in an ordered way.
  • The relationships between two or more items are frequently represented by the points on a graph.
  • The study of graphs, which are mathematical constructions used to represent pairwise relationships between things, is known as graph theory in mathematics. Vertices (also known as nodes or points) make up a graph in this sense, which are connected by edges (also called links or lines).
  • Undirected graphs, in which edges connect two vertices symmetrically, are distinguished from directed graphs, in which edges connect two vertices asymmetrically. One of the main topics of study in discrete mathematics is graphs.

Know more about graph numerical

brainly.com/question/16608196

#SPJ4

7 0
2 years ago
Evaluate the following expression:
Flauer [41]

Answer:

-4.89

Step-by-step explanation:

3 0
3 years ago
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