Sandra was 13 years old on her last birthday, and she will be 15 years old on her next birthday. How is that possible​

How do you summarize data in a two-way frequency table?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air