A SCUBA club comprises of 9 jumpers with cutting edge certificate and 6 with simply an essential certificate. They are arranging a jump for 4 of their individuals.

''10''

a) what number ways can these four individuals be picked if there are no limitations?

b) If the club decides express that at any rate one of these 4 individuals more likely than not progressed affirmation then what number of ways can the choice be made if only one chosen part has progressed accreditation?

9) A particular kind of light has a yield known to be regularly conveyed with a mean of 2500 lumens and a standard deviation of 75 lumens. Assuming the light yield is under a specific lower limit, that bulb is considered damaged.

a) Determine a lower detail cutoff with the end goal that just 5% of the made bulbs will be considered damaged.

b) What is the likelihood that haphazardly chosen bulb will have a light power somewhere in the range of 2400 and 2600 lumens?

Sympathetically answer every one of the three sections.

Box A has 3 red balls and 5 blue balls.

Box B has 5 red balls and 4 blue balls..A ball is picked indiscriminately from enclose An and put box B.Then a ball is picked aimlessly from box B

1 discover the example space of the examination

2 find the prob that the subsequent ball picked is red

3 given then second ball picked was red, find the prob that first picked ball was red.

1. In the event that the example size n=2 and the populace change is 7.75,what is the difference of the examining dispersions of means?

2. In the event that the example size n=3 and the populace change is 8.5,what is the standard deviation of the examining dispersions of means?

3. What is the mean of the populace if the mean of the inspecting conveyance of the methods is 14.0?

4. Which of the accompanying states that: "If tests of size n, where n is adequately enormous, are drawn from any populace with a mean and standard deviation ?, at that point the examining conveyance of test implies approximates a typical dispersion"?

5. A battery maker asserts that its midgrade battery has a normal existence of 50 months with a standard deviation of a half year. With the understanding that the makers' case is valid, discover the likelihood that 30 haphazardly chose battery of this kind will last under 48 months.(Note: Round to the closest hundredths)