You want to estimate the mean SAT score of all college applicants with margin of error of 15. You know the standard deviation of SAT scores is historically 100. Find the sample size needed to estimate the mean with 90% confidence. Critical Values: Z0.05 1.645 Z0.025 = 1.96 Z0.01 = 2.325 Z0.005 = 2.575

828. all there is to it!

here, if you ever need with rounding (or other forms of arithmetic/math) again, use this:

thats the rounding one, but if you just click the top left, it shows you all the calculators you may need!

x= 149. 24+7=31. 180-31=149

your welcome

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

pls mark as brainliest

not sure but it may be b, as i said i'm not sure.