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Kay [80]
3 years ago
12

You draw a coin from a collection of 4 coins. 2 are fair coins, and 2 are weighted so they land on heads 90% of the time. you ca

nnot tell the coins apart through inspection. you choose a coin and flip it once. what is the probability that the coin lands heads up? express your answer as a decimal.
Mathematics
1 answer:
stepan [7]3 years ago
4 0

The coin we choose is equally likely to be fair or unfair, since the ratio of fair to unfair coins is 2:2 = 1:1.

So, 50% of the times we pick a fair coin, which lands on heads with probability 50%.

The other 50% of the times we pick an unfair coin, which lands on heads with probability 90%.

Since these two events are mutually exclusive (a coin is either fair or unfair), the probability of having the coin to land on heads is

\underbrace{0.5\times 0.5}_{\text{fair coin lainding on heads}} + \underbrace{0.5\times 0.9}_{\text{unfair coin lainding on heads}} = 0.25 + 0.45 = 0.65

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Oksanka [162]
Did yhu do 5 and 8 ?
3 0
3 years ago
In the above figure, the radius of curvature is 10 ft and the height of the segment is 2 ft. What's the length of the chord?
erma4kov [3.2K]
A  about 12 feet is the lenth of the cord

4 0
3 years ago
Given the equation Y -3 equals 1/2 (X +6 )in point slope form identify the equation of the same line in standard form
liberstina [14]

The standard form of a line:

Ax+By=C

We have the equation of a line in the slope-point form:

y-3=\dfrac{1}{2}(x+6)      use distributive property

y-3=\dfrac{1}{2}x+3       add 3 to both sides

y=\dfrac{1}{2}x+6        multiply both sides by 2

2y=x+12       subtract x from both sides

-x+2y=12      change the signs

x-2y=-12

4 0
3 years ago
Plz help plz plz help helpe ​
jeka57 [31]

Answer:

-2 1/5, -1 2/5, 1/5, |-3/5|, |-1 1/5| ,|-2 2/5|

Step-by-step explanation:

Absolute value means take the positive value

-2 1/5

|-1 1/5| = 1 1/5

|-2 2/5| = 2 2/5

1/5

|-3/5| = 3/5

-1 2/5

We want the numbers from smallest to largest

The most negative is

-2 1/5, -1 2/5

Then to the fractions

1/5, |-3/5|

Then the positive numbers

|-1 1/5| ,|-2 2/5|

3 0
3 years ago
A store buys a digital watch for $80 and sells it for $95 what is the percent of increase
Marina86 [1]
About 1.19 %

80*1.19= 95.2 Since 2 is not 5 or above it get knocks down to 95 exactly 
8 0
3 years ago
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