Frequency of visits by Blue Tits and Great Tits

Peanuts and bird seed was scattered around bird tables and placed in feeders at 1040 hrs on Tuesday 25th March 2008, and observation of Blue Tits and Great Tits began at 1045 for a 30 minute period. This was repeated throughout the day at different times and the results were as follows. (Blue Tits took only peanuts whereas Great tits seemed to favour sunflower seeds) Almost every bird took their chosen food away.

1045 until 1115 82 Blue Tit visits 28 Great Tit visits

1355 until 1425 93 Blue tit visits 35 Great Tit visits

1500 until 1530 95 Blue Tit visits 32 Great Tit visits

this equates to an average of 90 Blue Tits every 30 mins and 31 Great Tits over same period

We also weighed sample batches of Peanuts and found that they each weighed on average approx 0.5g

Blue Tits weigh approx 11 gms whereas Great Tits weigh approx 19 gms

Given that Blue Tit numbers remain fairly constant throughout the day and that 1 individual bird was seen to take 1min 12 secs to eat a peanut can anyone out there estimate how many Blue tits we have visiting . We estimate that a total of approx 427gms of peanuts were removed by Blue Tits during the observation time period .
If each bird eats its own body weight in peanuts per day(11g) we recon that we have at least 38 individual birds is this true???