Astationary store has decided to accept a large shipment of ball-point pens if an inspection of 20 randomly selected pens yields no more than two defective pens. find the probability that the shipment is accepted if 5% of the total shipment is defective?

Probability that the shipment is accepted is 92.45%.

Step-by-Step Explanation:

Since we have given that

Number of total pens = 20

Probability of defective pens = 5%

Probability of good pens = 95%

We need to find the probability that the shipment that yields no more than two defective pens.

So, we will use "Binomial distribution:

Hence, Probability that the shipment is accepted is 92.45%.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.