A super car fan
1. A software house found that the project value received over the past year were approximately normally distributed , with a mean of $43,000 and a standard deviation of $8,500 . Suppose the project value remains the same next year.
a) What proportion of new projects would you expect to be $35,000 or less?
b) What proportion of new projects would you expect to be between $30,000 and $45,000?
2.The probability that a bearing meets a specification is 0.92 . Six bearings are picked at random . Calculate the probability that
a)all six meet the specification
b)more than four meet the specification
c)one or none meets specification and
d)and exactly four meet the specification1 個解答小學及中學教育7 年前
please help me to solve the question below,thx!1 個解答小學及中學教育8 年前
1.Given that the quadratic equation f(x) = 2x^2 - kx +12 attains its minimum value at x=5/2 .Find
a)the value of k
b)the greatest value of 4 - f(x)
2.Given 2x^2 + 6x +9 = a(x+b)^2 +c,where a,b and c are real constants
a)Find the values of a,b and c
b)Hence,write down the least value of 2x^2 + 6x +91 個解答數學1 十年前