Question

A survey that collected demographic data from respondents asked them to categorize their annual incomes (in thousands of dollars) into the groups in the table to the right. The number of respondents for each income group is also shown in the table. Income Number of Respondents $20 to under $30 61 $30 to under $40 113 $40 to under $50 126 $50 to under $60 27 $60 to under $70 36 Complete parts a) and b). a) Calculate the approximate average income of the respondents. The approximate average income of the respondents is $ 41.3 thousand. (Round to one decimal place as needed.) b) Calculate the approximate variance and standard deviation of the incomes of the respondents. The approximate variance of the incomes of the respondents is thousand. (Round to two decimal places as needed.)

          A survey that collected demographic data from respondents asked them to categorize their annual incomes (in thousands of dollars) into the groups in the table to the right. The number of respondents for each income group is also shown in the table.

Income Number of Respondents
$20 to under $30 61
$30 to under $40 113
$40 to under $50 126
$50 to under $60 27
$60 to under $70 36

Complete parts a) and b).

a) Calculate the approximate average income of the respondents.
The approximate average income of the respondents is $ 41.3 thousand.
(Round to one decimal place as needed.)
b) Calculate the approximate variance and standard deviation of the incomes of the respondents.
The approximate variance of the incomes of the respondents is thousand.
(Round to two decimal places as needed.)

A survey that collected demographic data from respondents asked them to categorize their annual incomes (in thousands of dollars) into the groups in the table to the right. The number of respondents for each income group is also shown in the table.

Income Number of Respondents
20 to under30 61
30 to under40 113
40 to under50 126
50 to under60 27
60 to under70 36

Complete parts a) and b).

a) Calculate the approximate average income of the respondents.
The approximate average income of the respondents is 41.3 thousand.
(Round to one decimal place as needed.)
b) Calculate the approximate variance and standard deviation of the incomes of the respondents.
The approximate variance of the incomes of the respondents is thousand.
(Round to two decimal places as needed.)

Added by Gabriel L.

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