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
lianna [129]
3 years ago
15

A box contains10 pens, 5 of the pens are red, 4 are balck and 1 are bluem What is the probability of pulling out a black pen fir

st, putting it back into the box, and then pulling a red pen ?
Mathematics
1 answer:
antiseptic1488 [7]3 years ago
6 0
Pulling out a black pen first will grant you a 40% chance of that occurring, then when you put it back the probability of you pulling out a red pen would be 50% so in decimal form these two values would be .40 and .50 multiply these two together you should get .20 or a 20% chance. Also a written fraction would be 1/5, all of which are valid answers.
You might be interested in
In a randomly selected sample of 1169 men ages 35–44, the mean total cholesterol level was 210 milligrams per deciliter with a s
Aneli [31]

Answer:

The highest total cholesterol level a man in this 35–44 age group can have and be in the lowest 10% is 160.59 milligrams per deciliter.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 210, \sigma = 38.6

Find the highest total cholesterol level a man in this 35–44 age group can have and be in the lowest 10%.

This is the 10th percentile, which is X when Z has a pvalue of 0.1. So X when Z = -1.28.

Z = \frac{X - \mu}{\sigma}

-1.28 = \frac{X - 210}{38.6}

X - 210 = -1.28*38.6

X = 160.59

The highest total cholesterol level a man in this 35–44 age group can have and be in the lowest 10% is 160.59 milligrams per deciliter.

5 0
3 years ago
Help me plsss i need to do it fast 12 min left help me pls
Simora [160]

Answer:

$44

Step-by-step explanation:

She has 79 AFTER her grandfather gave her 35. So you would subtract 35 from the 75 and get $44

7 0
2 years ago
Read 2 more answers
A town in east Texas recieved 10 inches of rain in two weeks. If it kept raining at this rate for a 31-day month, how much rain
Gelneren [198K]
The best way to approach this problem is to find out how much fell in week. As you know what two weeks is, you simply have to halve this, giving you that one week is 5 inches of rain. One you have this, you can multiply this by 4 (as this will give you 4 weeks, or 28 days), and this gives you 20 inches in 28 days. You should then find the odd three days. If you divide 5 by 7, this will give you the rain fall in one day. 5/7= 0.8 inches per day. You then have top multiply this by 3 (as you've got three odd days), and this gives you 2.4. You then have to add together 2.4 and 20, giving you 22.4
Therefore, if the rain continued to fall at the same rate for 31 days, it would receive 22.4 inches of rain.
Hope this helps :) 
8 0
3 years ago
Please please please please help
Sidana [21]

Answer:

I guess its the first one

Step-by-step explanation:

I think they're asking which one doesn't look like a regular shape. Tbh I have no idea

7 0
2 years ago
Read 2 more answers
Question
leva [86]

Answer:

1800 dollars

Step-by-step explanation:

We can set up an equation here to represent the exponential growth in Terry's bank account.

y = 1600(1.04)^x

We can plug in 3 for x since x is the # of years the account is receiving compound interest on.

y = 1600(1.04)^3

1.04^3 = 1.124864\\1.124864*1600= 1800

8 0
2 years ago
Other questions:
  • -2y=x+8<br><br> Three points
    13·1 answer
  • If f(x) = x2 – 25 and g(x) = x – 5, what is the domain of mc006-1.jpg?
    6·1 answer
  • What is 10 and 1/2 times 15 times 25
    7·2 answers
  • Subtract<br> (3x2 + 2x – 9) - (4x2 - 6x + 3)<br> Enter your answer, in standard form in the box.
    10·1 answer
  • Wнaт are тнe anѕwerѕ тo тнιѕ
    9·1 answer
  • Somebody help me ASAP
    15·1 answer
  • What is the denominator for 2/3 ?
    10·2 answers
  • Liza gets paid $5.50 an hour to babysit her little cousins. Last weekend, she watched them for three hours on Friday, nine hours
    6·2 answers
  • There is a population of 10,000 bacteria in a colony. If the number of bacteria doubles every 240 minutes, what will the populat
    7·1 answer
  • Given f(x) and g(x) = f(x) + k, look at the graph below and determine the value of k.<br> k=______.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!