I have a 50% in my math class I want at least a 70% my semester exam is 20% of my grade what do I need to score to get a 70%? PLEASE ANSWER FAST!!!

If you have a quiz for about 20 points aim for a 18-20 if you get 18 if the right that will get you to a 70%

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100%? dunno

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Please mark as Brainliest i need it so i can rank up to  expert! :D

answer: the anser is 3

step-by-step explanation:

c- 2o is equal to 9

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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