If strep bacteria causes the infection, it can remain contagious for up to 2 weeks without treatment. However, antibiotics can shorten the contagious period and li â¦ mits to about 24 to 48 hours once the therapy starts.     http://health.top54u.com/post/How-Long-is-Tonsillitis-Contagious.aspx.
Calculate Options Implied Volatility in Excel. Implied Volatility Function: Returns the annualized volatility of an underlying security implied by the market price of a European call or put option on that security, based on Black-Scholes valuation. Description of parameters.
Excel Pv Function Examples. Example 1. In the following spreadsheet, the Excel Pv function is used to calculate the present value of an annuity that pays $1,000 per month for a period of 5 years. The interest is 5% per year and each payment is made at the end of the month.