|
Tutors Answer Your Questions about Describing-distributions-with-numbers (FREE)
Question 1142276: 6) The mean salary of 5 employees is $42100. The employee salaries have 2 modes: $34000 and $50500. If the median salary gets a $2400 raise, then ...
a) What is the new mean?
New Mean = $
b) What is the new median?
New Median = $
Click here to see answer by greenestamps(13200)   |
Question 1142276: 6) The mean salary of 5 employees is $42100. The employee salaries have 2 modes: $34000 and $50500. If the median salary gets a $2400 raise, then ...
a) What is the new mean?
New Mean = $
b) What is the new median?
New Median = $
Click here to see answer by MOO04182020(3)  |
Question 1147116: A psychologist is interested in the conditions that affect the number of dreamsper month that people report in which they are alone. We will assume that basedon extensive previous research, it is known that in the general population thenumber of such dreams per month follows a normal curve, with
=
5
and
=
4.
The researcher wants to test the prediction that the number of suchdreams will be greater among people who have recently experienced a trau-matic event. Thus, the psychologist studies 36 individuals who have recentlyexperienced a traumatic event, having them keep a record of their dreams fora month. Their mean number of alone dreams is 8. Should you conclude thatpeople who have recently had a traumatic experience have a significantlydifferent number of dreams in which they are alone? (a) Carry out a
Z
test usingthe five steps of hypothesis testing (use the .05 level). (b) Make a drawing of thedistributions involved. (c) Explain your answer to a person who has never had acourse in statistics.
Click here to see answer by ikleyn(52781)  |
Question 1150361: The weights for newborn babies is approximately normally distributed with a mean of 5.1 pounds and a standard deviation of 2 pounds.
Consider a group of 1300 newborn babies:
1. How many would you expect to weigh between 3 and 9 pounds?
2. How many would you expect to weigh less than 7 pounds?
3. How many would you expect to weigh more than 6 pounds?
4. How many would you expect to weigh between 5.1 and 10 pounds?
Click here to see answer by MathLover1(20849)  |
Question 1150361: The weights for newborn babies is approximately normally distributed with a mean of 5.1 pounds and a standard deviation of 2 pounds.
Consider a group of 1300 newborn babies:
1. How many would you expect to weigh between 3 and 9 pounds?
2. How many would you expect to weigh less than 7 pounds?
3. How many would you expect to weigh more than 6 pounds?
4. How many would you expect to weigh between 5.1 and 10 pounds?
Click here to see answer by MOO04182020(3) |
Question 1150360: The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.3 days and standard deviation of 1.7 days. Use your graphing calculator to answer the following questions. Write your answers in percent form. Round your answers to the nearest tenth of a percent.
a) What is the probability of spending less than 7 days in recovery?
%
b) What is the probability of spending more than 5 days in recovery?
%
c) What is the probability of spending between 5 days and 7 days in recovery?
%
Click here to see answer by Boreal(15235)  |
Question 1155440: The weights for newborn babies is approximately normally distributed with a mean of 6 pounds and a standard deviation of 1.4 pounds.
Consider a group of 1000 newborn babies:
1. How many would you expect to weigh between 4 and 9 pounds?
2. How many would you expect to weigh less than 7 pounds?
3. How many would you expect to weigh more than 6 pounds?
4. How many would you expect to weigh between 6 and 10 pounds?
Click here to see answer by dkppathak(439)  |
Question 1155444: A variable is normally distributed with mean 21 and standard deviation 9. Use your graphing calculator to find each of the following areas. Write your answers in decimal form. Round to the nearest thousandth as needed.
a) Find the area to the left of 21.
b) Find the area to the left of 19.
c) Find the area to the right of 20.
d) Find the area to the right of 23.
e) Find the area between 19 and 26.
Click here to see answer by Boreal(15235) |
Question 1161078: PLEASE HELP ME! I REALLY APPRECIATE ANY SUPPORT!
1) Suppose that the distribution for the number of points scored in a game by Steph Curry can be described by an approximate normal curve, with a mean of 30 and a standard deviation of 8. About how many points are needed to ensure there is only approximately a 2.5% chance that Steph exceeds this amount?
2) Lastly, assume the scoring distribution of Knicks phenom RJ Barret is
approximately normal in shape. Suppose there is approximately 0.15% chance that R.J scores more than 26 points, and a 2.5% chance that he scores less than 6 points. What is his mean and standard deviation of points scored?
Click here to see answer by Boreal(15235) |
Question 1161981: The average grade of a subject is 1.89 for the whole class, with a standard deviation of 0.63. If a sample is 25 students is being taken, then find the probability of getting the average of this sample to be within the range of 1.6 and 2.0.
Click here to see answer by Theo(13342)  |
Question 1161992: Suppose in fact 60% of all Filipino adults between the ages of 30 and 39 exercises at least 3 days per week. If we take a random sample of 100 Filipino adults in their 30s, what is the probability that at least 70% of them exercise at least 3 days per week?
Click here to see answer by Theo(13342) |
Question 1161983: The true proportion of residents at small barangay that favored the genuine opposition senatorial candidates is 85%. What is the probability that at least 75% of the 60 residents favored the genuine opposition?
Click here to see answer by Boreal(15235) |
Question 1161983: The true proportion of residents at small barangay that favored the genuine opposition senatorial candidates is 85%. What is the probability that at least 75% of the 60 residents favored the genuine opposition?
Click here to see answer by MOO04182020(3) |
Question 1161980: The average grade of a subject is 1.89 for the whole class, with a standard deviation of 0.63. If a sample is 25 students is being taken, then find the probability of getting the average of this sample to be within the range of 1.6 and 2.0.
Click here to see answer by Edwin McCravy(20055)  |
Question 1161984: Suppose in fact 60% of all Filipino adults between the ages of 30 and 39 exercises at least 3 days per week. If we take a random sample of 100 Filipino adults in their 30s, what is the probability that at least 70% of them exercise at least 3 days per week?
Click here to see answer by Boreal(15235) |
Question 1162116: the mean test score of 50 students in a statistics class is 80 with a standard deviation of 7. if the test scores known to be normally distributed, calculate the following.
1. what proportion of the students who scored between 80 and 90?
2. what percentage of the students who scored from 60 to 80?
3. what is the probability of the students who scored between 70 and 85?
4. how many students have scored between 85 and 96?
5. how many students obtained a score range from 68 to 75?
6. howmany students who scored greater than 93?
7. How many of the students scored less than 65?
8.find the percentage of the students who scored less than 90?
9.if 30% of the students fail, what is the passing score?
10. Find the range of score that covers the central 78.88% of the students?
Click here to see answer by Boreal(15235) |
Question 1164725: A population has the parameters:
μ = 43.3 and σ = 9.8
You intend to draw a random sample of size using:
n = 165
What is the mean of the distribution of sample means?
What is the standard deviation of the distribution of sample means?
(Report answer accurate to 2 decimal places.)
Click here to see answer by Boreal(15235) |
Question 1177457: Seventy-seven percent of Americans favor spending government money to develop alternative sources of fuel for automobiles. For a random sample of 215 Americans, find the mean, variance, and standard deviation for the number who favor government spending for alternative fuels?
Click here to see answer by Boreal(15235) |
Question 1179100: 100 students attended a party, 79 were interviewed and 54 of the 79 met the case definition of the disease.
53 took the drink and out of them 50 is sick and 3 is well.
26 did not take the drink and out them 4 is sick and 22 is well.
1. What is the association between the drink and illness
2. The attributable proportion for the drink
Click here to see answer by ikleyn(52781) |
Question 1182257: A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1462 and the standard deviation was 319. The test scores of four students selected at random are 1890,1180 ,2210,and 1350. Find the z-scores that correspond to each value and determine whether any of the values are unusual.
The z-score for 1890 is____?
Round to two decimal places as needed.)
Click here to see answer by math_tutor2020(3817) |
Question 1186716: ] Assuming that the 26 letters in the English language alphabet comprise a
population,
1. Briefly explain how a simple random sample of size n = 7 can be obtained
with no mode(s). No calculations would be involved.
2. Showing your work, find the total number of simple random samples of
size n = 7 possible, none having any mode.
3. Showing your work, what is the probability of drawing a simple random
sample of size n = 7 containing the set A, B, C, D, X, Y, Z, using a 6-ball
capacity scoop and at first attempt, from a bag containing 26 ping pong balls,
each uniquely labeled one of the 26 letters?
Click here to see answer by Edwin McCravy(20055) |
Question 1188632: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 46 and a standard deviation of 11. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 35 and 79?
Click here to see answer by Solver92311(821)  |
Question 1188632: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 46 and a standard deviation of 11. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 35 and 79?
Click here to see answer by Shin123(626)  |
Question 1191028: I am having trouble on a problem from my homework assignment. This is the question word for word from the text book:
The average earnings of year-round full-time workers 25-34 years old with a bachelor's degree or higher were $58,500 in 2003. If the standard deviation is $11,200, what can you say about the percentage of these workers who earn;
a. between $47,300 and $69,700?
b. More than $80,900?
c. How likely is it that someone earns more than $100,000?
Click here to see answer by MathLover1(20849) |
Question 1191028: I am having trouble on a problem from my homework assignment. This is the question word for word from the text book:
The average earnings of year-round full-time workers 25-34 years old with a bachelor's degree or higher were $58,500 in 2003. If the standard deviation is $11,200, what can you say about the percentage of these workers who earn;
a. between $47,300 and $69,700?
b. More than $80,900?
c. How likely is it that someone earns more than $100,000?
Click here to see answer by ikleyn(52781) |
Question 1191287: The time taken for a student to complete an exam is normally distributed with a mean of 40 minutes and a standard deviation of 5.5 minutes.
A student is randomly selected. What is the probability that the student completes the task in less than 48 minutes?
Click here to see answer by ikleyn(52781) |
Question 1191285: The time taken for a student to complete an exam is normally distributed with a mean of 40 minutes and a standard deviation of 5.5 minutes.
The probability a student takes between k and 48 minutes is 0.4. What is the value of k?
Click here to see answer by Boreal(15235) |
Question 1194722: Analyze the given data below and answer the following questions:
Zian's Scores in Math and English
ENGLISH: 50, 40, 28, 35, 37
MATH: 36, 29, 35, 30, 35
MEASURES OF VARIABILITY ENGLISH
Mean 38
Standard Deviation 8.03
Variance 64.5
RAnge 22
MEASURES OF VARIABILITY MATH
Mean 33
Standard Deviation 3.24
Variance 10.5
RAnge 7
Question 1:In what subject does Zian performs well?
Question 2: In what subject does Zian shows consistent score?
Question 3: Are his scores in english are more spread out than math?
Click here to see answer by Alan3354(69443)  |
Question 1195153: The heights of the adult male population on a given island are normally distributed with mean 70 inches and standard deviation of 2.5 inches.
(a.) what percentage of heights is within 1 standard deviation of the mean? That is, what percentage of heights is between 70-2.5=67.5 inches and 70+2.5=72.5 inches?
(b.) what percentage of male population are shorter than 65 inches?
(c.) what percentage of males are taller than 67 inches?
(d.) what percentage is between 67 and 68 inches?
Click here to see answer by ikleyn(52781) |
Question 1197517: Questions 24-25
The scores of a standardized IQ test are normally distributed with a mean score of 100 and a standard deviation of 15.
Question 24
Find the probability that a randomly selected person has an IQ score higher than 105.
Question options:
0.9522
0.3694
-1.15
0.6306
Question 25
A random sample of 55 people is selected from this population. What is the probability that the mean IQ score of the sample is greater than 105?
Question options:
0.0067
0.3694
0.6306
0.9933
Click here to see answer by ewatrrr(24785)  |
Question 1197532:
x
P
(
x
)
x
2
x
P
(
x
)
x
2
P
(
x
)
0 0.22
0
Correct
0
Correct
0
Correct
1 0.15
1
Correct
0.15
Correct
0.15
Correct
2 0.18
4
Correct
0.36
Correct
0.72
Correct
3 0.16
9
Correct
0.48
Correct
1.44
Correct
4 0.29
16
Correct
1.16
Correct
4.64
Correct
Find the mean. Round to two decimal places.
μ
=
Find the standard deviation. Round to three decimal places.
σ
=
Click here to see answer by ikleyn(52781) |
Question 1197769: Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.62 and a standard deviation of 0.4 Using the empirical rule, what percentage of the students have grade point averages that are at least 1.82? Please do not round your answer.
Click here to see answer by math_tutor2020(3817) |
|
|
| |
