In a box there are twenty light bulbs. Three of these are broken. What is the...
In a box there are twenty light bulbs. Three of these are broken. What is the probability that you get the most do you get a lamp if you choose four lamps randomly from the box?
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In a box there are twenty light bulbs. Three of these are
broken. What is the...
In a box there are 5 light bulbs including 3 good bulbs and 2 broken bulbs....
In a box there are 5 light bulbs including 3 good bulbs and 2 broken bulbs. One person who tries to turn one by one until they get 2 good bulbs then stop. Call X is the number of times the person has tested the light bulb. Calculate the expectation, variance and standard deviation of X. (Bonus: please give me some explanations. thanks u)
Choose the correct answer. Please explain your answers thank you The three light bulbs in the...
Choose the correct answer. Please explain your answers
thank you
The three light bulbs in the circuit all have the same resistance. Given that brightness is proportional to power dissipated, the brightness of bulbs B and C together, compared with the brightness of bulb A, is Twice as much, the same, half as much? The light bulbs in the circuit are identical. When the switch is closed, 12 V 12 VF Both lamps go out The intensity of light bulb...
A box in a certain supply room contains four 40-watt light bulbs, five 60-watt bulbs, and...
A box in a certain supply room contains four 40-watt light bulbs, five 60-watt bulbs, and six 75-watt bulbs. Suppose that three bulbs are randomly selected. a. What is the probability that exactly two of the selected bulbs are rated 75-watt? b. What is the probability that all three of the elected bulbs have the same rating? c. What is the probability that one bulb of each type is selected? d. What is the probability that at least two of...
A box contains 20 light bulbs of which 4 are defective. If one person randomly selects...
A box contains 20 light bulbs of which 4 are defective. If one person randomly selects 8 bulbs from the box, and a second person then takes the remaining bulbs, what is the probability that all 4 defective bulbs will be obtained by the same person?
A box in a certain supply room contains four 40-W lightbulbs, three 60-W bulbs, and five...
A box in a certain supply room contains four 40-W lightbulbs, three 60-W bulbs, and five 75-W bulbs. Suppose that three bulbs are randomly selected. (Round your answers to four decimal places.) (a) What is the probability that exactly two of the selected bulbs are rated 75-W? (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one bulb of each type is selected? (d) Suppose now that...
A box in a certain supply room contains three 40-W lightbulbs, seven 60-W bulbs, and five...
A box in a certain supply room contains three 40-W lightbulbs, seven 60-W bulbs, and five 75-W bulbs. Suppose that three bulbs are randomly selected. (Round your answers to four decimal places.) (a) What is the probability that exactly two of the selected bulbs are rated 75-w2 079 (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one blb of each type is selected? d) Suppose now...
You have to catch a falling box of light bulbs with a mass of 10 kg...
You have to catch a falling box of light bulbs with a mass of 10 kg and bring the box of light bulbs to rest without breaking, while the box of light bulbs was falling with a velocity of 5 m/s. What is the minimum amount of time you should use to stop the bulbs from moving if they will break with only 150 N of force?
A light bulb factory produces 674 light bulbs every hour. Approximately 2.08% of the light bulbs...
A light bulb factory produces 674 light bulbs every hour. Approximately 2.08% of the light bulbs are defective, and do not work. Using the binomial distribution, what is the expected number of defective bulbs produced in an hour? For all questions where the answer is a probability, put your answer in percentage form (e.g. 72.4218 not 0.724218) and then round to four decimal places. You do not need to include a % sign.
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57...
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With this information, answer the following questions. (a) What proportion of light bulbs will last more than 61 hours? (b) What proportion of light bulbs will last 51 hours or less? (c) What proportion of light bulbs will last between 59 and 61 hours? (d) What is the probability that a randomly selected light bulb lasts...
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57...
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With this information answer the following questions. (a) What proportion of light bulbs will last more than 62 hours? (b) What proportion of light bulbs will last 50 hours or less? (c) What proportion of light bulbs will last between 58 and 62 hours? (d) What is the probability that a randomly selected light bulb lasts...
Choose the correct answer. Please explain your answers
thank you
The three light bulbs in the circuit all have the same resistance. Given that brightness is proportional to power dissipated, the brightness of bulbs B and C together, compared with the brightness of bulb A, is Twice as much, the same, half as much? The light bulbs in the circuit are identical. When the switch is closed, 12 V 12 VF Both lamps go out The intensity of light bulb...
A box in a certain supply room contains four 40-watt light bulbs, five 60-watt bulbs, and six 75-watt bulbs. Suppose that three bulbs are randomly selected. a. What is the probability that exactly two of the selected bulbs are rated 75-watt? b. What is the probability that all three of the elected bulbs have the same rating? c. What is the probability that one bulb of each type is selected? d. What is the probability that at least two of...
A box contains 20 light bulbs of which 4 are defective. If one person randomly selects 8 bulbs from the box, and a second person then takes the remaining bulbs, what is the probability that all 4 defective bulbs will be obtained by the same person?
A box in a certain supply room contains three 40-W lightbulbs, seven 60-W bulbs, and five 75-W bulbs. Suppose that three bulbs are randomly selected. (Round your answers to four decimal places.) (a) What is the probability that exactly two of the selected bulbs are rated 75-w2 079 (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one blb of each type is selected? d) Suppose now...
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With this information, answer the following questions. (a) What proportion of light bulbs will last more than 61 hours? (b) What proportion of light bulbs will last 51 hours or less? (c) What proportion of light bulbs will last between 59 and 61 hours? (d) What is the probability that a randomly selected light bulb lasts...
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With this information answer the following questions. (a) What proportion of light bulbs will last more than 62 hours? (b) What proportion of light bulbs will last 50 hours or less? (c) What proportion of light bulbs will last between 58 and 62 hours? (d) What is the probability that a randomly selected light bulb lasts...
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