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A study discovered that Americans consumed an average of 10.3 pounds of chocolate per year. Assume that the annual chocolate consumption follows the normal distribution with a standard deviation of 3.4 pounds. Complete parts a through c below.
a. What is the probability that an American will consume less than 6 pounds of chocolate next year?(Round to four decimal places as needed.)
b. What is the probability that an American will consume more than 8 pounds of chocolate next year?(Round to four decimal places as needed.)
c. What is the probability that an American will consume between 7 and 11 pounds of chocolate next year?(Round to four decimal places as needed.)
d. What is the probability that an American will consume exactly 9 pounds of chocolate next year?(Round to four decimal places as needed.)
e. What is the annual consumption of chocolate that represents the 80th percentile?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
Alcohol withdrawal occurs when a person who uses alcohol excessively suddenly stops the alcohol use. Studies have shown that the onset of withdrawal is experienced a mean of 39.5 hours after the last drink, with a standard deviation of 18 hours.
A gun is fired straight upward. The bullet leaves the gun at 1000 ft. per sec. The equation for the bullet's velocity is v = -32 t + 1000. What is the velocity at 3 sec.?
Based only on this information, estimate the probability that you could ski at this resort after May 25 next year. What is the average closing day based on history?
Problem 2: Construct a scatter plot of the following data using Minitab:
what is the coefficient of determination? if an r0.8 what is the coefficient of
If Larry gets a 70 on a physics test where the mean is 65 and the standard deviation is 5.8, where does he stand in relation to his classmates?
Suppose two such fuses are in series and operate independently in a system. Find the pdf of the lifetime Y of the system. (The system will work only if both the fuses operate.)
customers arrive at the atm at the rate of 12 customers per hour and spend 2 minutes on average on all the
the number of spools produced until a spool is produced that contains one or more defects?
in a recent survey of 200 art students 163 of them indicated that they would rather be poked in the eye with a sharp
A multiple regression analysis between yearly income (Y in $1,000s), college grade point average (X1), age of the individuals (X2), Compute the coefficient of determination
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