A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of 4. (a)Everyone who scores in the top 30% of the distribution gets a certificate. What is the lowest score someone can get and still earn a certificate?

27.1

Step-by-step explanation:

Given:

mean=25

standard deviation=4

z0.70=0.525

z*sd = x-mean= 2.1

the  lowest score for the top 30%: x=27.1

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

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1,8,15,22,29,36,43,50

step-by-step explanation: