A study suggests that the extinction rate r(t) of marine animal families during the Phanerozoic Eon can be modeled by the function r(t) = 3130/(t + 262) for 0 ≤ t ≤ 544, where t is time elapsed (millions of years) since the beginning of the eon 544 million years ago. Thus, t = 544 refers to the present time, t = 540 is 4 million years ago, and so on.

Compute the average of R_N and L_N with N = 5 to estimate the total number of families that became extinct in the periods 100 ≤ t ≤ 150 and 350 ≤ t ≤ 400.