How 4 matches from 7 by chance be 1 in 50 in natasha demkina experiment?

In the Natasha Demkina experiment, the probability of correctly matching 4 out of 7 matches by chance alone is approximately 1 in 50. This level of accuracy is considered statistically significant and suggests that Demkina's claims of having X-ray vision may have some merit. However, further controlled studies would be needed to definitively prove her abilities.