Probability that mean life time of bulbs is at least hours

Reference no: EM13135640

A manufacturer claims that the average life of its light bulb is 1,200 hours. Assume that the life of all such bulbs has a normal distribution with mean 1,200 hours, and standard deviation 70 hours. Determine the probability the mean life time of a random sample of 9 bulbs will be:

a) At least 1,180 hours.
b) Between 1,185 and 1,190 hours

Reference no: EM13135640

Questions Cloud

What is the breakeven number of gadgets b must sell : Firm B produces gadgets. The price of gadgets is $2 each. Firm B has total fixed costs of $300,000 and variable costs of $1.40 per gadget. The corporate tax rate is 40%. What is the breakeven number of gadgets B must sell to make a zero after tax ..

Cultural values and orientation : Values are tied to culture, they do not operate in isolation. Values are critical, primarily because they compel our actions. In this regard, it is necessary for us to examine the concept of values within the context of culture.

Which of the following is correct in regard to equity : Which of the following is correct in regard to equity trading securities?

Product differentiation or cost leadership : Is Maloney's strategy one of product differentiation or cost leadership? Explain briefly. Identify at least one key element that you would expect to see included in the balanced scorecard

Probability that mean life time of bulbs is at least hours : Normal distribution with mean 1,200 hours, and standard deviation 70 hours. Determine the probability the mean life time of a random sample of 9 bulbs will be At least 1,180 hours.

Prepare a diagram using rationale : Analyse the article/case study from the perspective of at least two different classical ethical theories and present well reasoned arguments for your assessments and recommendations.

What amount of compensation expense should staley recognize : In order to retain certain key executives, Staley Corporation granted them incentive stock options on December 31, 2012. 30,000 options were granted at an option price of $35 per share. Market prices of the stock were as follows.

Culture-international management : Culture is an important factor to consider in the realm of international management. The different perspectives from various cultures are what make international business an emerging ideology.

Determine the estimated warranty liability at december : Determine the estimated warranty liability at December 31 for the units sold in November and December. Prepare the journal entries to record the estimated liability for warranties and the costs incurred in honoring 900 warranty claims. (Assume actu..

User Account

All Pages