Math Assignemtn help?

Got a few questions I could use help on please,

Q1. Claire ordered packages of beads from 2 online companies. The mean of the masses of the packages from company A is 72 g with standered deviation of 3.4g. The mean of the masses of the packages from company B is 68.5g with a standeed deviation of 1.8g. She ordered 10 packages from each company. Which company's packages have more consistent mass? Show work.

Q2. At the end of a bowling tournament, 3 friends analyzed their scores.

Lucia's mean bowling score is 144 with a standered deviation of 12.

Zheng's mean bowling score is 88 with a standered deviation of 6.

Kevin's mean bowling score is 108 with a standered deviation of 5.

Whose the more consistent bowler? Show work.

Q3. The ages of members of a hiking club are normally distributed, with a mean of 32 and a standered deviation of 6 years. What percent of the members are younger then 20?

Q4. A teacher is analyzing the class results for a physics test. The marks are normally distributed a mean of 76 an standered deviation of 4. Sketch the normal curve for the test, Hopefully someone could explain what "sketch the normal curve for the test" means.

Q5. Determine the % of data to the left of the z-score; z=1.05

Q6. Determine the % of the data to the right of the z-score; z= -0.68

Q7. Determine the % of the data between the fallowing z-scores; z= -0.14 nd z= 0.09

Q8. The results of a survey have a confidence interval of 42.8% to 51.6%, 19 times out f 20. Determine the margin of error. Hopefully someone could explain what the margin of error is.

Q9. a Tile company produces glass kitchen tiles hat have a average thickness of 71mm, with a standered deviation of 0.4mm For premium quality tiles, the tiles must have a thickness between 70mm and 71.5mm. What % to the nearest whole #, of the total population can be sold as a premium quality tiles?

ALL ANSWERS APPRECIATED!!!!

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