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 below. The number of respondents for each income group is also shown in the table.   Income                     Number of Respondents$20 to under $30                  68$30 to under $40                 113$40 to under $50                 125$50 to under $60                  23$60 to under $70                  36 Calculate the approximate average income of the respondents.   The approximate average income of the respondents is__ thousand. ​(Round to one decimal place as​ needed.)

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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 below. The number of respondents for each income group is also shown in the table.
 
Income                     Number of Respondents
$20 to under $30                  68
$30 to under $40                 113
$40 to under $50                 125
$50 to under $60                  23
$60 to under $70                  36
Calculate the approximate average income of the respondents.
 
The approximate average income of the respondents is__ thousand.
​(Round to one decimal place as​ needed.)
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