​Recently, a random sample of 25–34 year olds was​ asked, "How much do you currently have in​ savings, not including retirement​ savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings.      Savings                                   Frequency   ​$0–$199                                       340 ​$200–$399                                   98 ​$400–$599                                   50 ​$600–$799                                   17 ​$800–​$999                                   13 ​$1000–​$1199                               8 ​$1200–$1399                                1   The sample mean amount of savings is $

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​Recently, a random sample of 25–34 year olds was​ asked, "How much do you currently have in​ savings, not including retirement​ savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings.

 
   Savings                                   Frequency
 
​$0–$199                                       340
​$200–$399                                   98
​$400–$599                                   50
​$600–$799                                   17
​$800–​$999                                   13
​$1000–​$1199                               8
​$1200–$1399                                1
 
The sample mean amount of savings is $
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