Determine the area under the standard normal curve that lies to the left of (a) z=0.92 (b) z=-1.26 (c) z= -0.64 (d) z= -1.09

Your main choices here are (1) a calculator with statistical functions and (2) a table of z-scores.

(a) On my TI-83 Plus calculator I typed in normcdf(-1000, 0.92). The calculator returned the value 0.821. This is approx. 8/10 of the total area under the std normal curve.

(b) I typed in normcdf(-1000, -1.26) and got 0.104

(c) I typed in normcdf(-1000, -0.64) and got 0.261

(d) I typed in normcdf(-1000, -1.09) and got 0.138

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500