A sample of scores from a research study examining stress in the workplace has a mean of and a standard deviation of 2.3 . John has scored a 6.2 in his stress survey. What is John's Z score for the survey?

1. Dari 4 siswa putra dan 2 siswa putri akan dibentuk tim yang beranggotakan 3 orang. Jika anggota tim tersebut beranggotakan paling sedikit 2 siswa putra, banyaknya cara membentuk tim tersebut adalah .... A. 3 B. 4 C. 12 D. 16 E. 48

19. \( 1+2+3+4+5+\ldots+n=\frac{n(n+1)}{2} \) (a) i) Show that this formula is true for the sum of the first 8 natural numbers. ii) Find the sum of the first 400 natural numbers. (b) i) Show that \( 2+4+6+8+\cdots+2 n=n(n+1) \). ii) Find the sum of the first 200 even numbers. iii) Find the sum of the first 200 odd numbers. (c) i) Use the formula at the beginning of the question to find the sum of the first \( 2 n \) natural numbers. ii) Find a formula, in its simplest form, for \( 1+3+5+7+9+\cdots+(2 n-1) \).

What best describes a portfolio? Purchasing a 10 -year CD from your bank with a \( 3 \% \) APY. An investor's collection of investments. Taking the car you bought for \( \$ 3,000 \) and selling it for \( \$ 4,000 \). Purchasing a share of ownership in Nike.

Q 2. Find the values of \( \cos \theta \) and \( \tan \theta \), if \( \sin \theta=-\frac{3}{5} \) and \( \pi<\theta<\frac{3 \pi}{2} \)

Given the function \( g(x)=3 x^{2}+6 \), find the indicated values. \( \begin{array}{lll}\text { a. } g(-15) & \text { b. } g(-1) & \text { c. } g\left(\frac{4}{3}\right)\end{array} \)