Computing the variance and standard deviation

Reference no: EM1319689

The United States Postal Service report 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six letters are randomly sent to different locations.

a. What is the probability that all six arrive within two days?

b. What is the probability that exactly five arrive within two days?

c. Find the mean number of letters that will arrive in two days.

d. Compute the variance and standard deviation of the number that will arrive within two days.

Reference no: EM1319689

Questions Cloud

Compute accounting bad debts : Determine the effect on EZ's accounting equation relative to the sale, collections, and write-offs of accounts receivable during 1007. What is the net realizable value of accounts receivable on December 31, 2007, under each assumption in part (2)?

Probability related to parking cars : A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location.

Compute interest expenses from given data : Income statement, Little Books Inc. recently reported $3 million of net income. Its EBIT was $6 million, and its tax rate was 40 percent.

Preparation of adjustment entries and balance sheet : The Chandler Corporation began business on January 2, 2007. It is now time for Chandler to prepare its financial statements for 2007. The bookkeeper at Chandler was able to complete the asset section of the balance sheet, but he needs your help to..

Computing the variance and standard deviation : Compute the variance and standard deviation of the number that will arrive within two days.

Working with segmented income statement : In which of the markets would you recommend that the company focus its advertising campaign? Show computations to support your answer.

Potential for extreme sampling error : Impact on sampling of increasing sample size is: The potential for extreme sampling error is reduced.

Explaining troubleshooting : AV software has removed the malware from highly infected system. After first reboot, an error message is showed which consists of a reference to the strange DLL file which is missing. Explain two options you must use in order to start troubleshoot..

Describing lan and wan : Write down in words and describe the meanings of terms LAN and WAN. Explain how do they differ? State three basic topologies for LAN use, and describe the differences among then.

User Account

All Pages