Marks are normal with mean 65 and standard deviation 7. The top 2.28% of students get an A. What is the least mark for an A? (Take $P(0 < Z < 2) = 0.4772$ .)

51

Correct answerYour answer

72

Correct answerYour answer

79

Correct answerYour answer

86

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Worth noting

51 goes 2 standard deviations below the mean: that marks the bottom 2.28%.

Ten questions from Normal Distribution, at your own pace.

Ten questions from Normal Distribution, at your own pace.

Marks are normal with mean 65 and standard deviation 7. The top 2.28% of students get an A. What is the least mark for an A? (Take P(0<Z<2)=0.4772P(0 < Z < 2) = 0.4772P(0<Z<2)=0.4772.)