I am confused by these 2 questions.
Use technology or the z-distribution table on pages...
Mathematics, 07.04.2020 17:59, nina288
I am confused by these 2 questions.
Use technology or the z-distribution table on pages A-1 to A-2 in the reference guide to solve. (here is the link to the book) https://k12reader. kitaboo. com/k12reader/kitaboo-reflowable. html#/main/https;%7C%7Ck12reader. kitaboo. com%7C72568%7Chtml5%7C72568?readerT ype=new&pageMode=double&pag e=A2
4) The scores on a standardized test are normally distributed with a mean of 500 and a standard deviation of 100. Suppose 6000 students took the test. Approximately how many students scored above 490?
A) 5048
B) 3239
C) 2761
D) 952
5) Lengths of newborn girls are normally distributed with a mean of 49.2 cm and a standard deviation of 1.8 centimeters. Consider a group of 2000 newborn girls. How many girls will be 51 centimeters or shorter?
A) 1683
B) 1856
C) 1928
D) 1964
Answers: 3
Mathematics, 21.06.2019 16:50, gesic2003
Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?
Answers: 3
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The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square
Answers: 1
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At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?
Answers: 1
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