Ellen takes a multiple-choice quiz that has 5 questions, with 3 answer choices for each question. What is the probability that she will get exactly 2 answers correct by guessing? Probabilities should be entered as
fractions in simplest form, decimals rounded to the nearest thousandth, or percents rounded to the
nearest tenth.
The probability that Ellen will get any one answer correct is
So, the probability that Ellen will get exactly 2 answers correct by guessing is

the answer is the third / last answer

step-by-step explanation:

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:

7/2

(decimal: 3.5)

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step-by-step explanation:

2,160 π

step-by-step explanation: