4.21 It is claimed that the number of errors made by a typesetter is Poisson distributed with an average rate of 4 per 1000 words. One hundred random samples of 1000 words from this typesetter are examined and the number of errors are counted as shown below. Are these data consistent with the claim?

No. of errors 0 1 2 3 4 5 No. of samples 10 16 20 28 12 14