Business, 17.03.2020 01:53 willwhitlock803

Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully loaded is 6,000 pounds and the standard deviation is 310 pounds. Assume that the population follows the normal distribution. Fifty-five trucks are randomly selected and weighed.

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Answer from: danielahchf

95% of 55 trucks will have weights between 5915.5 lbs and 6084.5 lbs

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Complete question:

Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully loaded is 6,000 pounds and the standard deviation is 310 pounds. Assume that the population follows the normal distribution. Fifty-five trucks are randomly selected and weighed. Within what limits will 95% of the sample mean occur

Subtract 1 from sample size to find degree of freedom(df). Here sample size is 55,so

df= 55-1= 54

To determine α, subtract confidence interval from 1 and then divide by 2. Here confidence interval is 95% or 0.95, so

α= (1-0.95)/2= 0.025

Use t-distribution table(see attachment) to find t-value for α=0.025 and df=54. So t=2.021(since df=54 is not listed in the table, I have used the table row corresponding to the next lowest value of df that is 40)divide sample deviation, 310, by root of sample size that is 55. So,

$\frac{310}{\sqrt{55} }$ = 41.8

Now multiply the answers from last two steps 41.8 × 2.021= 84.5lower limit= 6000-84.5=5915.5upper limit= 6000+84.5=6084.5

95% of 55 trucks have weights between 5915.5 lbs and 6084.5 lbs

Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully loa

Answer from: Quest

88 because 4 plus 4 equals 8. 40 plus 40 equals 80. 80 plus 8 equals 88

Answer from: Quest

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

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