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
SpyIntel [72]
3 years ago
7

Given the mean of a random variable, X, is 10 and P(X < 11) = 0.67. Find the standard deviation.

Mathematics
1 answer:
Taya2010 [7]3 years ago
4 0

Answer:

Step-by-step explanation:

This is the problem we need to solve:

z=\frac{x_i-\bar{x}}{\sigma} and we have everything but the z-score (which we find from a table) with our main unknown being the standard deviation.

If the probability that a random variable that is less than 11 is .67, we first have to find the z-score from the table that is closest to .67, and there are 2:

P(z < .43) = .66640 and P(z < .44) = .67003

We'll use z = .44

.44=\frac{11-10}{\sigma} and

.44=\frac{1}{\sigma} and

\sigma=\frac{1}{.44} so

σ = 2.27 (check it; it works!)

You might be interested in
Given the system below:
Andrei [34K]
If F(x) =g(x) =2x,
x can be any value
4 0
3 years ago
Read 2 more answers
T-SHIRTS You can buy 3 T-shirts for $24. Write a proportion that gives the cost
GrogVix [38]

7:56

Figure out what 7/3 is so you can multiply 24 by that number. Is is 2 1/3 so when you multiply 2 1/3 by 24 it gets you to 56 so the proportion is 7:56

8 0
2 years ago
Company 1 charges $12 per foot of fence. <br> Find the cost if Company 1 completes the job.
natta225 [31]

Step-by-step explanation:

how many feet of fence is he doing

5 0
3 years ago
During an Apollo moon landing, reflecting panels were placed on the moon. This allowed Earth-based astronomers to shoot laser be
rusak2 [61]

Answer:

The distance between the astronomers and the moon was 7.56*10^{8] meters.

Step-by-step explanation:

We have that the speed is the distance divided by the time, so:

v = \frac{d}{t}

In this problem, we have that:

The reflected laser beam was observed by the astronomers 2.52 s after the laser pulse was sent. This means that t = 2.52.

If the speed of light is 3.00 times 10^8 m/s, what was the distance between the astronomers and the moon?

We have that v = 3*10^{8}m/s.

We have to find d. So:

v = \frac{d}{t}

d = vt

d = 3*10^{8}*2.52

7.56*10^{8]

The distance between the astronomers and the moon was 7.56*10^{8] meters.

7 0
3 years ago
Xerxes is selling cups of lemonade. He is selling regular and pink lemonade in 3 sizes: small, medium, and large. The table disp
raketka [301]

Part 1

Add up the values in the table: 90+36+54+45+63+72 = 360

This means 360 total drinks were sold. Of that total, 54 were medium regular.

The percentage of medium regular is 54/360 = 0.15 = 15%

Apply this percentage to the 640 customers he plans to sell to

15% of 640 = 0.15*640 = 96

<h3>Answer: 96</h3>

============================================

Part 2

It sounds like your teacher wants you to find the probability of picking pink lemonade. The table says that 36 small, 45 medium, and 72 large pink lemonades were sold. That means 36+45+72 = 153 pink lemonades were sold out of the 360 total

153/360 = 0.425

Then go through each answer choice to note that 17/40 = 0.425 as well

Therefore, 153/360 = 17/40

Answer: 17/40

3 0
3 years ago
Other questions:
  • Can someone help me solve this equation for 3/4w-1/2w-4= 12
    11·1 answer
  • Help me ASAP I need a math equation for this someone pls pls pls help me I don’t get it
    7·2 answers
  • It costs $24 for admission to an
    12·1 answer
  • Jonathan took a 35 questions test and
    15·2 answers
  • Please help with this qaestion
    12·2 answers
  • I am a square. One of my side is 9 feet long. What is my area?
    13·1 answer
  • Can someone help me with these questions please ?!!!
    12·1 answer
  • what is the absolute value of the difference in dollars between the flat fees the two companies charge​
    15·1 answer
  • Factor each polynomial: 9x-6
    8·1 answer
  • Which of the following angles are congruent?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!