The mean grade on the last Geometry test was 78. If Kate
scored a 90 and her z-score
was 2.5, find the standard
deviation for the test.

4.8

Step-by-step explanation:

z = (x − μ) / σ

2.5 = (90 − 78) / σ

σ = 4.8

77

step-by-step explanation:

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: