According to a survey, 50% of americans were in 2005 satisfied with their job. assume that the result is true for the current proportion of americans. a. find the mean and standard deviation of the proportion for a sample of1000.

Step-by-step explanation:

The probability distribution of sampling distribution is known as it sampling distribution.

The mean and standard deviation of the proportion is given by :-

, where p =population proportion and  n= sample size.

Given : According to a survey, 50% of Americans were in 2005 satisfied with their job.

i.e. p = 50%=0.50

Now, for sample size n= 1000 , the mean and standard deviation of the proportion will be :-

Hence, the mean and standard deviation of the proportion for a sample of 1000:

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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option: d is the correct answer.

d) none of the above.

step-by-step explanation:

clearly from the figure attached to the question we could see that there is no shape given. hence without any shape given in the figure and after rotation we can't obtained a square pyramid.

since, to obtain a image we need a proper figure of the pre-image so that it can be transformed.

hence, the correct answer is:

d) none of the above.

step-by-step explanation: