21 is decreased to 3. round to the nearest tenth of percent

The verbal translation for the difference of m and 7 increased by 15

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

Pls brainliest will be awarded if answer is correct