The value of a random variable having the highest frequency is mode. Hence, statement I is true. The mode of a data is not alwaysunique. The mode of the data 2, 2, 3, 3, 2, 5, 4, 5, 5, 8, 6, 6 is 2 and 5. Here, 2 and 5 both occur three times. Hence, statement II is false.