jacob rolled a six sided number cube 20 times he rolled a 4 eight times. what is the probability of rolling a 4

Which statements regarding efg are true? check all that apply.

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

Can some one explain this i got sent this. is this a threat i’m scared