How to add dropout rates in tensorflow model?

droputrate_model = tf.keras.Sequential([
    tf.keras.layers.Dense(50, activation='relu', input_shape=[len(X.keys())]),
    tf.keras.layers.Dropout(0.2),
    tf.keras.layers.Dense(50, activation='relu', input_shape=[len(X.keys())]),
    tf.keras.layers.Dropout(0.2),
    tf.keras.layers.Dense(10,activation="softmax")
  ])