Thread: Printf not working?

I need to print to 2 decimal places and I'm trying to use the printf method, but for some reason I keep getting an error. I've looked through my code, but unless I'm missing a small detail, it looks okay to me.

		float sum = 0;
		float avg = 0;
		double[] rain = {0, 1.9, 1.5, 1.2, 1.1, 0.5, 0.03, 1.0};
 
		//Calculate sum of rain.
		for (int i = 1; i <= 7; i++) {
			sum += rain[i];
		}
		//Calculate average of rain
		avg = (sum / 7);
 
		//Printout
		//Titles
		System.out.println("Day\t " + " Rain");
		//rainfall and days
		for (int j = 1; j <= 7; j++) {
		System.out.println(j + "\t  " + rain[j]);
		}
		//avg rainfall
 
		System.out.printf("The average rainfall for the week is: %.2f" + avg);
}
}

Sorry, meant to put it in...

Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '.2f'
	at java.util.Formatter.format(Unknown Source)
	at java.io.PrintStream.format(Unknown Source)
	at java.io.PrintStream.printf(Unknown Source)
	at basicArray.main(basicArray.java:29)