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Normal Distribution · Question 58 of 68

Question 58

MediumOriginal question

Daily sales are normal with mean 50 units and standard deviation 4. What is the probability that a day's sales are more than 46 units? (Take P(0<Z<1)=0.3413P(0 < Z < 1) = 0.3413.)

Options for question 58

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. z=46−504=−1z = \frac{46 - 50}{4} = -1.

  2. P(Z>−1)=0.5+0.3413=0.8413P(Z > -1) = 0.5 + 0.3413 = 0.8413.

Worth noting

0.1587 is the chance of fewer than 46 units.

Concept
The share above a value
Typical time
90 s
Your time
—
The rule this testsUsing the normal distribution
Practise this chapter →

Ten questions from Normal Distribution, at your own pace.

Practise this chapter →

Ten questions from Normal Distribution, at your own pace.