Find sample mean lifetime will be less than t hours

Reference no: EM13137443

The lifetime of a new brand of clock battery is normally distributed with a mean of 8,200 hours and a variance of 2,500 hours. A random sample of 40 clock batteries of this brand was selected.

1) What is the probability that the sample mean lifetime will be between 8,210 and 8,220 hours?
2) There is the probability of 0.95 that the sample mean lifetime will be less than t hours.What is the value of t?

Reference no: EM13137443

Questions Cloud

Amortization schedule-effective interest method : Prepare the journal entry DeFilippo Company would make to record this transaction. (b) Prepare an amortization schedule for the note using the effective-interest method.

- making decisions : What are the considerations/particularities you must take into account when - making decisions - communicating in a diverse workplace environment different from a non-diverse environment?

Explain direct stress and strain : Direct Stress and Strain, A steel rod having a cross-sectional area of 0.005m2 and length 3m is attached to supports.

Assessments on syrian chemical weapons : You are to critically analyse two seperate reports/intelligence assessments on Syrian chemical weapons use/capability. Within the context of intelligence assessment how useful/valid are these reports. Notwithstanding they are unclassified reports.

Find sample mean lifetime will be less than t hours : A random sample of 40 clock batteries of this brand was selected. There is the probability of 0.95 that the sample mean lifetime will be less than t hours.What is the value of t?

How high can the person climb : A 51-kg person drinks 390. g of milk, which has a "caloric" value of approximately 3.0 kJ g-1. If only 16% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake?

Public policy issue. : the paper. Here is the question. In less than 100 words, please apply one of the public policy issues that I have confronted or currently confront in either my personal life or job. You can use any public policy issue.

Revenues and expenses for the current year : ABC, Inc. has the following assets, liabilities, revenues and expenses for the current year.

What is probability of an employee selected random : There are 400 employes and 100 of them smoke. There are 250 males working for the company and 75 of them smoke. What is probability of an emloye selected random?

User Account

All Pages