Matlab entry for duration of PhD (Astronomy) during the period 1991 and
2003. <br>

phd=[5 6 6 6   7 6   6 5 8   7 7 7   6 5 5   6 5   6 6 6 6 6 6 7   6 6 7
 6 6 6 7 5   6 6 6 7 4   9 7 6 5 5 4   5   7 4 5]

<br>

Mean = 5.98 yr; Median=6 yr.