Delivery time for packages

Reference no: EM1393540

Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.

a) For a package selected at random, what is the probability that it will be delivered in 18 hours or less? (Round your answer to four decimal places.)

b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.)

Reference no: EM1393540

Questions Cloud

Finding genotype of the two parental plants : A tall, yellow, round plant is crossed to a dwarf, green, round one. The ratios occurred in F1 generation 3/8 tall, green, round; 3/8 dwarf estimate the genotype of the two parental plants.

Determination for genetics probability : Two parents with normal pigmentation have an albino child. Determine the probability that their next 4 children will consist of two albinos and two with normal pigmentation, in any order?

Number of treatments-in a two way anova : In a two-way ANOVA, there are 4 levels for factor A, 5 levels for factor B, and 3 observations for each combination of factor A and factor B levels. The number of treatments in this experiment equals:

Argument or compose of a rebuttal : Do you think this statement has any merit? Why or why not? Explain why the manager may have said it and then further substantiate his argument or compose a rebuttal.

Delivery time for packages : Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.

Confidence interval for the average number of hours : A market researcher wants to find the 99% Confidence Interval for the average number of hours people spend online each day.

Determine the z-transforms and sketch the roc : Design a digital Chebyshev-II filter and determine the coefficients of the impulse response h(n) of the FIR filter and Determine the Z-transforms and sketch the ROC

Chi-square test statistic and table value : The calculated chi-square test statistic and the table value for a 0.05 significance level are:

Randomized block design : A randomized block design with 4 treatments and 5 blocks produced the following sum of squares values: SST = 1951, SSTR = 349, SSE = 188. The value of SSB must be:

User Account

All Pages