how to convert the nsmutablesrrsy response into float variable?

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Mobile

iPhone

Hi all,
How to convert NSMutableArray dataset into float dataset.
Below code displaying total data when we use like;

Webservices *details=[[Webservices alloc] init];
    [details getMobileNumberDetails:phnotextfield.text];
    NSLog(@"longitudes Arrays from %@",details.resultData);

 "-91.57696007",
     "10.343234",
     "74.982343",
     "76.464844",
     "76.464844",

but my intension is I have to store the total data into float variable.
Help me to solve the problem.