The loads carried by an elevator are found to follow a normal distribution with a mean weight of 1812 lbs, and a standard deviation of 105.3 lbs. In which interval centered about the mean does the load lie, in 95% of all cases? A) [1606, 2018] B) [1606, 1812] C) [1812, 2018] D) [1602, 2000]
Accepted Solution
A:
Answer:No one of the mentionedThe interval is: [ 1706.7 : 1917.3] to find 95.5 % of all valuesStep-by-step explanation:We deal with a Normal Distribution, : μ = 1812 and σ = 105.3We know centered at mean value and at both sides at values σ/2 we will find 68.3 % of all values . In fact σ/2 to the left and σ/2 to the right means an interval μ + σ .[μ + σ/2 : μ - σ/2 ] will lie 68.3 % of valuesFollowing the same reasoning but now for a wider interval[μ + σ : μ - σ ] We will find 95.5 % of all values in our case that interval is:1812 + 105,3 = 1917.31812 - 105,3 = 1706.7[ 1706.7 : 1917.3] will be the interval to find 95.5 % of all values