import { ExamGrader } from "../ExamGrader";
import { GradedExam } from "./assigned_exams";
import { GradedStats } from "./GradedStats";
export type AppliedCurve = {
    adjustedScore: number;
    report_html: string;
    parameters: {
        [index: string]: string | number;
    };
};
export declare abstract class ExamCurve {
    abstract applyTo(ex: GradedExam): AppliedCurve;
    abstract initialize(grader: ExamGrader): void;
    abstract lock(grader: ExamGrader): void;
}
export declare class IndividualizedNormalCurve extends ExamCurve {
    readonly targetMean: number;
    readonly targetStddev: number;
    readonly locked: boolean;
    private curving_parameters?;
    constructor(stats: GradedStats, targetMean: number, targetStddev: number, locked?: boolean);
    private getLockfileName;
    initialize(grader: ExamGrader): void;
    private computeIndividualCurvingParameters;
    private mostFavorable;
    lock(grader: ExamGrader): void;
    applyTo(ex: GradedExam): AppliedCurve;
}