Chapter 2, Section 3, Exercise 095 For the dataset 41,42,44,45,45,46,46,48,48,50

Question

Chapter 2, Section 3, Exercise 095 For the dataset 41,42,44,45,45,46,46,48,48,50,53,53,54,54,56,57 Correct answer. Correct. (a) Without doing any calculations, estimate which of the following numbers is closest to the mean. Entry field with correct answer 56 53 49 44 SHOW HINT SHOW SOLUTION SHOW ANSWER Incorrect answer. Incorrect. (b) Without doing any calculations, estimate which of the following numbers is closest to the standard deviation. Entry field with incorrect answer 1 10 46 54 5 SHOW HINT Partially correct answer. Your answer is partially correct. Try again. (c) Use StatKey or other technology to find the mean and the standard deviation for this dataset. Click here to access StatKey. Round your answers to one decimal place. meanequalsEntry field with correct answer 48.9 standard deviationequalsEntry field with

Explanation / Answer

a) Data are from 41 to 57. and we have to guess the mean without calculations.

Middle values are 48 , 50 so the mean closest to 49.

b) Mean is closest to 49.

Standard deviation is dispersion of data value from mean.

Dispersed values left to the mean is near to 5 and right also near to 5

So standard deviation is closest to 5

c) Now by using technology we have to find mean and standard deviation.

By using excel we can find easily.

First enter all values in to excel.

Use command =AVERAGE(select values)

So we get mean = 48.9

For finding standard deviation use command =STDEV(select values)

So standard deviation is 5.1

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