A company is preparing to launch a new web site to sell its products. From past experience, they know that purchases at the site will occur as a Poisson process with on average 30 purchases every 10 minutes. a) What is the expected time in minutes before the first purchase after the site opens? Give your answer to four decimal places.
b) What is the probability that more than 0.14 minutes pass before the first purchase? Give your answer to four decimal places.
c) What is the expected time in minutes until the fifth purchase? Give your answer to four decimal places.

The following information is available for ellen's fashions, inc. for the current month. book balance end of month $ 7 comma 000 outstanding checks 700 deposits in transit 4 comma 500 service charges 120 interest revenue 45 what is the adjusted book balance on the bank reconciliation?

Warren company plans to depreciate a new building using the double declining-balance depreciation method. the building cost $870,000. the estimated residual value of the building is $57,000 and it has an expected useful life of 20 years. assuming the first year's depreciation expense was recorded properly, what would be the amount of depreciation expense for the second year?

Ticker services began operations in 2015 and maintains long-term investments in available-for-sale securities. the year-end cost and fair values for its portfolio of these investments follow.portfolio of available-for-sale securities cost fair valuedecember 31, 2015 $ 369,060 $ 357,988 december 31, 2016 420,728 445,972 december 31, 2017 572,190 676,901 december 31, 2018 864,007 768,966 prepare journal entries to record each year-end fair value adjustment for these securities.calculation adjustment required to fair value adjustment.12/31/15 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) 12/31/16 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) 12/31/17 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) 12/31/18 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) record the year-end adjusting entry for the securities portfolio as of december 31, 2015.date general journal debit creditdec 31, 2015 record the year-end adjusting entry for the securities portfolio as of december 31, 2016.date general journal debit creditdec 31, 2016 record the year-end adjusting entry for the securities portfolio as of december 31, 2017.date general journal debit creditdec 31, 2017 record the year-end adjusting entry for the securities portfolio as of december 31, 2018.date general journal debit creditdec 31, 2018