Mathematics, 30.09.2019 11:00 FreyaLouise
The ages of students in a school are normally distributed with a mean of 15 years and a standard deviation of 2 years. approximately what percent of the students are between 14 and 18 years old?
a. 24.17%
b. 62.47%
c. 30.85%
d. 93.32%
i've tried solving this, and i ended up with z-scores -0.5 for 14-year-olds and 1.5 for 18-year-olds. and i also matched them using a chart and got "0.3085" and "0.9332", but i don't know if i should add or subtract because, in a similar problem i had to add but if i add the percentages, it exceed 100%. i am confused;
Answers: 2
Mathematics, 21.06.2019 19:00
Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?
Answers: 2
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