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fiasKO [112]
2 years ago
12

A bag contains 30 lottery balls numbered 1-30 a ball is selected, not replaced,then another is drawn.find each probability

Mathematics
1 answer:
Valentin [98]2 years ago
6 0
The probability of the first event with x possible outcomes is equal to x/30. Also, the probability of the second event with y possible outcomes is y/29.

(1) P of 2 digit number, 21/30
      P that the number is 4 is 1/29
Multiplying both probabilities will give us 7/290

(2) P that number is 19 is 1/30
      P that the number is multiple by 4 is 6/29
The answer is 1/145

(3) P that number is 24 is 1/30
      P that number is less than 15 is 14/29
The answer should be 7/435.

(4) P that number 1st number is perfect square is 5/30
   P that second number is perfect square is 4/29.
The answer is 2/87. 
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Bogdan [553]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ The formula for circumference is \pi d

1) \pi d = 31.4

Divide both sides by \pi

d = 9.99 (consider this to be 10)

Half this to find the radius

10/2 = 5

It would be figure B.

2) \pi d = 37.68

Divide both sides by \pi:

d = 11.99 (consider this to be 12)

Divide by 2 to find the radius:

12/2 = 6

It would be figure C.

3) area = \pi r^2

\pi r^2 = 153.86

r^2 = 48.97515909

r = 6.998 (consider this to be 7)

It would be figure D

4) \pi r^2 = 113.04

r^2 = 35.98174

r = 5.998 (consider this to be 6)

It would be figure C.

5) radius = diameter / 2

radius = 3

\pi (3)^2 = 28.27433

It would be option C

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

3 0
2 years ago
Read 2 more answers
20% of the students in the class play an instrument. if there are 35 students in class, how many play an instrument?
kondor19780726 [428]

Answer:

7 students play an instrument.

Calculation:

35=100%

20%=[20×35]÷100

=7

6 0
2 years ago
HELP PLEASE I WILL GIVE BRAINLESTT
Inessa [10]

Answer:

Look down

Step-by-step explanation:

AC=BD

8*2=16

15*2=30

AC=16

BD=16

AB=30

CD=30

5 0
3 years ago
Plz explain.
slega [8]
Idk, why does the world need problems like this, not like everyone is going to grow up to be a math teacher.
8 0
2 years ago
In kilometers, the approximate distance to the earth's horizon from a point h meters above the surface can be determined by eval
Maslowich
In kilometers, the approximate distance to the earth's horizon from a point h meters above the surface can be determined by evaluating the expression 

d= \sqrt{12h}

We are given the height h of a person from surface of sea level to be 350 m and we are to find the the distance to horizon d. Using the value in above expression we get:

d= \sqrt{12*350}=64.81

Therefore, the approximate distance to the horizon for the person will be 64.81 km
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