For a switchboard suppose the time X in minutes until the th

For a switchboard, suppose the time X (in minutes) until the third call of the day arrives is gamma distributed with scale parameter theta = 2 and shape parameter k = 3. If the switchboard is activated at 8 A.M. find the probability that the third call arrives before 8:06 AM. Can you help me check if the answer is 0.5768? Thank you,