QuestenaPráctica que te muestra qué repasar después
BuscarCrear una prueba
Pregunta 117

A fair coin is tossed 50 times and lands on heads 27 times. Select all statements that are true about this experiment. Select all that apply.

  1. The theoretical probability of heads is now 27 out of 50
  2. The two probabilities would have to agree exactly if the coin were fair
  3. The experimental probability of heads from these tosses is 27 out of 50Respuesta correcta
  4. The coin must be biased, because 27 is more than 25
  5. The theoretical probability of heads is still one halfRespuesta correcta

Explicación

An experimental figure records what actually happened, so 27 heads in 50 tosses gives 27 out of 50, while the value calculated from the coin stays at one half because the coin still has two equally likely sides. Expecting 25 heads and seeing 27 is an ordinary amount of variation over 50 tosses, so a fair coin is not obliged to deliver the calculated share exactly, and the run gives no reason to call the coin biased or to rewrite the calculated value.

Continúa con este test

Empezar la práctica
Comprender este tema (≈6 min)Volver a la prueba