You have a normal distribution of hours per week that music students practice. The mean of the values is 8 and the standard deviation of the values is 4.

According to the normal distribution, half of the music students practice between 5.3 to 10.7 hours each week.

What percentage of the students study less than 5.3 hours each week?

50%
20%
25%
12.5%

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

idk

step-by-step explanation: