02-dask-arrays-blocked-mean.py

sums = []
lengths = []
for i in range(0, 1000000000, 1000000):
    chunk = dset[i: i + 1000000]  # pull out numpy array
    sums.append(chunk.sum())
    lengths.append(len(chunk))

total = sum(sums)
length = sum(lengths)
print(total / length)