求破损率的详细步骤（最好是计算器的按法） 如有100个破了20个求破损率 有100个破损率20%求破了多少个.

我们先算出成本总价 1440*3.5=5040 1440个灯成本总价是5040元
我们再算出除去损坏后的数量 1440-115=1325 除去损坏后的数量是1325个
我们在用总价除以损坏后的数量 5040*1325=3.80 那么成本价就是3.8元
破损率用损坏的除以进货数量 115/1440*100=7.98% 那么得出的结果就是损坏率是7.98%

(20×5＋30×3＋50×3)％＝3.4％

1, as you know, you have to specifications need to cut from the 1200*600, so the processing and product price plus the broken rate, this is we can offer the lowest price. 2, you need XX of anti-skid products report and related product data, we first because XX is a new product, so at this stage, we do a polishing surface skid resistance test, the other surface effects we didn't do. In view of new products, so the plane and pitted until X months of anti-skid report. As for the product structure, the following is the raw material for the project general: 1, powder 2, 3 ceramic sand, clay 4, pigment combustion rate is above 90% (the temperature is 1210 degrees) 3300*300 mosaic and 100*100 TILE, I don't know whether you there are requirements on the thickness? Whereas before 1000*450 specifications, price is according to the thickness of 12MM newspaper, so we must know the thickness of 300*300 we can determine how to give you a quotation. 4, in addition, for you the required XX series 200*200MM of each color of each surface model, first, we are only X color homogeneous X surfaces. Second, the X color is only 100*100MM small example, if you have to 200*200 specification, then we must arrange the cutting process, which can take up to three days.

1-（1-1/8)^6×（1-1/2)²=930927/1048576≈0.89
发现破损的概率不好算,因为可能有1,2,3,……,8个,而且是哪种的产品也需要分类考虑,太烦了,所以算反面,没有破损的概率是：（1-1/8)^6×（1-1/2)²,所以发现破损的概率就是1-（1-1/8)^6×（1-1/2)²
对啊

人为破损率=人为破损的数量/统计总数,这样才符合题意,因为破损率包含了人为损坏率和非人为损坏率.
（以上回答,）

这个很简单啊 当X=0%时 F(x）=2000
当X=2%时 F(x）=0