Daves first four test scores in algebra were 98%, 76%, 91%, and 89%. what does he need to earn on the next test so that his average for all five of these is exactly 90%? A. 90%
B. 100%
C. 96%
D. 89%

96%

Step-by-step explanation:

answer: -2+√x,-2-√x

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hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: