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Questions Bank (1538301 total)
Covariance is affected by the scale of the variables.
Yra žinoma, kas kiekvienas iš lynų AB ir AC gali atlaikyti didžiausią 8000 N tempimo jėgą. Apskaičiuokite mažiausią kampą θ, kuriuo reikėtų tvirtinti lynus prie krovinio, kad galima būtų pakelti 6223 N svorio krovinį.
Rėmas ABC, kurio AB o BC dalies ilgis b=1 m, pritvirtinta nepaslankiu cilindriniu lankstu A ir remiasi į glotnią atramą taške C. Rėmą veikia du išskirstyti krūviai q=13 N/m, AB dalyje pastovus, BC dalyje tiesiškai kintantis ir jėgų pora M=288 N·m. Rėmo sąvojo svorio nevertinkite. Apskaičiuokite atramos C reakciją.
A telephone number is selected at random from a directory. Suppose that denote the last digit of selected telephone number. The average and the variance of are, respectively,
The cumulative probability function of the daily number of customers visiting a retail store during a specific time slot () is given in the table below.
The expected value and variance of the daily number of costumers visiting the store are, respectively,
Let be a random variable that represents the number of brand B products that are purchased per day in a small market. The average and the standard deviation of the number of brand B products that are purchased per day are 2 and 0.5, respectively
It is known that the relationship between the number of brand C products that are purchased in this market per day, , and the variable is given by . The mean and variance of are, respectively,
Which correlation coefficient best matches the scatterplot shown below?