Geo-net, a cellular phone company, has collected the following frequency distribution for the length of calls outside its normal customer roaming area:

Length (min.) Frequency 0 6 5 26 5 6 10 75 10 6 15 139 15 6 20 105 20 6 25 37 25+ 18 400 The sample mean (x ) for this distribution is 14.3 minutes, and the sample standard deviation is 3.7 minutes. Determine whether these data are normally distributed 1a = .052.

( LO,1)