# Normal distributon problems – assume that the mean hourly cost to

1. Assume that the moderation hourly absorb to work a commercial airplane thrives the recognized classification after a while a moderation of $2,075 per hour and a exemplar irregularity of $225.

What is the loose absorb for the lowest 6 percent of the airplanes? (Round z rate to 2 decimal establishs. Omit the "$" type in your tally.)

Operating Costs $

2.The absorb per individual at a supermarket thrives an exponential classification. There are manifold common individuals and a few proportionately requirely ones. The moderation absorb per individual is $6.00. What is the percentage of individuals that absorb:

rev: 10_13_2011

(a) Less than $3.00? (Round your retort to 4 decimal establishs.)

Probability

3. A consistent classification is defined aggravate the season from 6 to 10.

(a) What are the rates for a and b?

a

b

________________________________________

(b) What is the moderation of this consistent classification?

Mean

(c) What is the exemplar irregularity? (Round your retort to 2 decimal establishs.)

Standard irregularity

(d) The aggregate area is 1.00.

(e) Find the verisimilitude of a rate more than 7. (Round your retort to 2 decimal establishs.)

Probability

(f) Find the verisimilitude of a rate among 7 and 9. (Round your retort to 1 decimal establish.)

Probability

4. The moderation of a recognized verisimilitude classification is 60; the exemplar irregularity is 5. (Round your retorts to 2 decimal establishs. Omit the % type in your tally.)

(a) About what percent of the observations lie among 55 and 65?

Percentage of observations %

(b) About what percent of the observations lie among 50 and 70?

Percentage of observations %

(c) About what percent of the observations lie among 45 and 75?

Percentage of observations %

7. The rupture for a one-bedroom lodging in Southern California thrives the recognized classification after a while a moderation of $2,300 per month and a exemplar irregularity of $220 per month. The classification of the monthly absorbs does not thrive the recognized classification. In reality, it is unconditionally skewed.

What is the verisimilitude of selecting a scantling of 70 one-bedroom lodgings and sentence the moderation to be at balanceest $2,250 per month? (Round z rate to 2 decimal establishs and last retort to 4 decimal establishs.)

9 Scrapper Elevator Company has 20 sales symbolicals who hawk their issue throughout the United States and Canada. The sum of units sold by each symbolical is listed under. Assume these sales figures to be the population rates.

2 3 2 3 3 4 2 4 3 2 2 7 3 4 5 3 3 3 3 5

Compute the Moderation of the population (globular to 1 decimal establish)

10 What is the type for exemplar hallucination of the moderation?