Question

For the following data, approximate the mean number of emails received per day. emails per day...

For the following data, approximate the mean number of emails received per day.

emails per day frequency

8-11 50

12-15 37

16-19 16

20-23 7

24-27 27

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1
Class X Frequency(f) fX
8-11 9.5 50 475
12-15 13.5 37 499.5
16-19 17.5 16 280
20-23 21.5 7 150.5
24-27 25.5 27 688.5
∑f=137 ∑fX=2093.5

.......................................................................................

Calculation of X:

(8+11)/2=9.5

=(12+15)/2=13.5

=(16+19)/2=17.5

=(20+23)/2=21.5

=(24+27)/2=25.5

..........................................................................................

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
For the following data, approximate the mean and sample standard deviation of the number of emails...
For the following data, approximate the mean and sample standard deviation of the number of emails received per day. (Round to 2 decimal places.) Emails(per day) Frequency            8-11 3 12-15 34 16-19 25 20-23 8 24-27 27
The number of spam emails received each day follows a Poisson distribution with a mean of...
The number of spam emails received each day follows a Poisson distribution with a mean of 50. Approximate the following probabilities. Apply the ±½ correction factor and round value of standard normal random variable to 2 decimal places. Round your answer to four decimal places (e.g. 98.7654). (a) More than 50 and less than 60 spam emails in a day. (b) At least 50 spam emails in a day. (c) Less than 50 spam emails in a day. (d) Approximate...
6. Using the class data (see Blackboard file - "Class Survey Data - PSS-10 and GAS")...
6. Using the class data (see Blackboard file - "Class Survey Data - PSS-10 and GAS") calculate the correlation between the GAS – Goal disengagement and the GAS – Goal reengagement scores. Write the results in a statistical statement. 7. Using the class data calculate the correlation between the GAS – Goal disengagement and the PSS-10 scores. Write the results in a statistical statement. 8. Using the class data calculate the correlation between the GAS – Goal reengagement scores and...
The data shown represents the number of chicken wings a chicken wing lover can eat in...
The data shown represents the number of chicken wings a chicken wing lover can eat in one sitting. Construct a grouped frequency distribution and a cumulative frequency distribution with 6 classes. 21 16 19 22 11 8 16 13 12 23 9 11 13 19 12 14 21 15 24 16 20 12 16
The unknown population mean number of advertising or solicitation emails a retail customer received per day...
The unknown population mean number of advertising or solicitation emails a retail customer received per day is 7.2. An advertising company wants to estimate the population number of solicitation e-mails a customer received per day. Which action should the company avoid taking according to the central limit theorem? Perform many samples of customers Include a maximum of ten customers in each sample Calculate the mean of the sample averages Use large sample sized
The following data, which was provided from a sample of 158 Mass Mutual employees, shows how...
The following data, which was provided from a sample of 158 Mass Mutual employees, shows how many phone calls they receive while they are at work. Phone calls (per day):              Frequency: 8-11                                         18 12-15                                       23 16-19                                       38 20-23                                       47 24-27                                       32 What is the standard deviation of the grouped data? a. 4.5 calls b. 5.237 calls c. 4.998 calls d. 5.077 calls
1. Suppose the number of junk emails you received per day has a Poisson distribution with...
1. Suppose the number of junk emails you received per day has a Poisson distribution with an average of five per day. a) What is the probability that you receive 3 junk emails per day? b) What is the probability that you receive at least 1 junk email per day? c) What is the probability that you receive at most 3 junk emails per day? d) What is the likelihood of receiving between 3 and 6 junk emails per day?
Assume that the total number of goals scored per week in Spor Toto Super League has...
Assume that the total number of goals scored per week in Spor Toto Super League has a Normal distribution with mean ? and standard deviation ?. The following data summarizes the total number of goals scored in the first 12 weeks of the 2014-15 season. Week # 1 2 3 4 5 6 7 8 9 10 11 12 Goals Scored 21 19 16 18 27 23 37 19 26 24 23 23 a) What is the average (?̅) and...
The results of a sample of 372 subscribers toWiredmagazine shows the time spent using the Internet...
The results of a sample of 372 subscribers toWiredmagazine shows the time spent using the Internet during the week. Previous surveys have revealed that the population standard deviation is 10.95 hours. The sample data can be found in the Excel test data file. What is the probability that another sample of 372 subscribers spends less than 19.00 hours per week using the Internet? Develop a 95% confidence interval for the population mean If the editors of Wiredwanted to have the...
____________________________________________ The results of a sample of 372 subscribers to Wired magazine shows the time spent...
____________________________________________ The results of a sample of 372 subscribers to Wired magazine shows the time spent using the Internet during the week. Previous surveys have revealed that the population standard deviation is 10.95 hours. The sample data can be found in the Excel test data file. What is the probability that another sample of 372 subscribers spends less than 19.00 hours per week using the Internet? ____________________________________________ Develop a 95% confidence interval for the population mean ____________________________________________ If the editors...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT